diff --git a/api/src/Entity/Activity.php b/api/src/Entity/Activity.php
index 3ca1837966..81291e5351 100644
--- a/api/src/Entity/Activity.php
+++ b/api/src/Entity/Activity.php
@@ -16,6 +16,7 @@
 use App\Repository\ActivityRepository;
 use App\State\ActivityCreateProcessor;
 use App\State\ActivityRemoveProcessor;
+use App\State\ActivityResetProcessor;
 use App\Validator\AssertBelongsToSameCamp;
 use App\Validator\AssertLastCollectionItemIsNotDeleted;
 use Doctrine\Common\Collections\ArrayCollection;
@@ -24,6 +25,7 @@
 use Symfony\Component\Serializer\Annotation\Groups;
 use Symfony\Component\Serializer\Annotation\SerializedName;
 use Symfony\Component\Validator\Constraints as Assert;
+use ApiPlatform\OpenApi\Model\Operation as OpenApiOperation;
 
 /**
  * A piece of programme that will be carried out once or multiple times in a camp.
@@ -39,6 +41,14 @@
             security: 'is_granted("CAMP_MEMBER", object) or is_granted("CAMP_MANAGER", object)',
             validationContext: ['groups' => ['Default', 'update']]
         ),
+        new Patch(
+            processor: ActivityResetProcessor::class,
+            security: 'is_granted("CAMP_MANAGER", object)',
+            uriTemplate: 'activities/{id}/reset_contents',
+            denormalizationContext: ['groups' => ['reset_contents']],
+            openapi: new OpenApiOperation(summary: 'Delete all programme content from this activity and replace it with a copy of the content of the connected category.'),
+            validationContext: ['groups' => ['Default', 'reset_contents']]
+        ),
         new Delete(
             processor: ActivityRemoveProcessor::class,
             security: 'is_granted("CAMP_MEMBER", object) or is_granted("CAMP_MANAGER", object)'
diff --git a/api/src/State/ActivityResetProcessor.php b/api/src/State/ActivityResetProcessor.php
new file mode 100644
index 0000000000..d2ed6d1027
--- /dev/null
+++ b/api/src/State/ActivityResetProcessor.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use App\Entity\Activity;
+use App\Entity\ContentNode\ColumnLayout;
+use App\Entity\ContentType;
+use App\State\Util\AbstractPersistProcessor;
+use App\Util\EntityMap;
+use Doctrine\ORM\EntityManagerInterface;
+
+/**
+ * @template-extends AbstractPersistProcessor<Activity>
+ */
+class ActivityResetProcessor extends AbstractPersistProcessor {
+    public function __construct(
+        ProcessorInterface $decorated,
+        private EntityManagerInterface $em
+    ) {
+        parent::__construct($decorated);
+    }
+
+    /**
+     * @param Activity $data
+     */
+    public function onBefore($data, Operation $operation, array $uriVariables = [], array $context = []): Activity {
+        // @phpstan-ignore nullsafe.neverNull
+        if (!isset($data->category?->rootContentNode)) {
+            throw new \UnexpectedValueException('Property rootContentNode of provided category is null. Object of type '.ColumnLayout::class.' expected.');
+        }
+        if (!$data->category->rootContentNode instanceof ColumnLayout) {
+            throw new \UnexpectedValueException('Property rootContentNode of provided category is of wrong type. Object of type '.ColumnLayout::class.' expected.');
+        }
+
+        // Delete the old content
+        $this->em->remove($data->rootContentNode);
+
+        // Copy content from the category
+        $targetCamp = $data->category->camp;
+        $rootContentNodePrototype = $data->category->rootContentNode;
+
+        $rootContentNode = new ColumnLayout();
+        $rootContentNode->contentType = $this->em
+            ->getRepository(ContentType::class)
+            ->findOneBy(['name' => 'ColumnLayout'])
+        ;
+        $data->setRootContentNode($rootContentNode);
+
+        $entityMap = new EntityMap($targetCamp);
+        $rootContentNode->copyFromPrototype($rootContentNodePrototype, $entityMap);
+
+        return $data;
+    }
+
+    private function deleteContent(Activity $activity): void {
+
+    }
+}
diff --git a/frontend/src/components/category/CategoryTemplate.vue b/frontend/src/components/category/CategoryTemplate.vue
index f453a21c59..068c36a443 100644
--- a/frontend/src/components/category/CategoryTemplate.vue
+++ b/frontend/src/components/category/CategoryTemplate.vue
@@ -4,6 +4,9 @@
       <template #categoryShort>
         <CategoryChip :category="category" dense />
       </template>
+      <template #applyToActivities>
+        <DialogApplyCategoryLayoutToActivities :category="category" :camp="camp" />
+      </template>
       <template #br><br /></template>
     </i18n>
 
diff --git a/frontend/src/components/category/DialogApplyCategoryLayoutToActivities.vue b/frontend/src/components/category/DialogApplyCategoryLayoutToActivities.vue
new file mode 100644
index 0000000000..85a6c8c08b
--- /dev/null
+++ b/frontend/src/components/category/DialogApplyCategoryLayoutToActivities.vue
@@ -0,0 +1,224 @@
+<template>
+  <DetailPane
+    v-if="isContributor"
+    v-model="dialogOpen"
+    max-width="900px"
+    :title="$tc('components.category.dialogApplyCategoryLayoutToActivities.title')"
+    icon="mdi-file-replace-outline"
+    :cancel-action="close"
+    :submit-action="apply"
+    submit-color="error"
+    submit-icon="mdi-bomb"
+    :submit-label="
+      $tc(
+        'components.category.dialogApplyCategoryLayoutToActivities.confirmApply',
+        selectedActivities.length
+      )
+    "
+    :submit-enabled="selectedActivities.length > 0"
+  >
+    <template #activator="{ on, attrs }">
+      <v-btn elevation="0" color="danger" :disabled="!isManager" v-bind="attrs" v-on="on">
+        <v-icon left>mdi-file-replace-outline</v-icon>
+        {{
+          $tc(
+            'components.category.dialogApplyCategoryLayoutToActivities.replaceActivityContents'
+          )
+        }}
+      </v-btn>
+    </template>
+
+    <p>
+      {{ $tc('components.category.dialogApplyCategoryLayoutToActivities.description') }}
+    </p>
+    <p>
+      <v-icon color="grey lighten-1">mdi-alert</v-icon>
+      {{ $tc('components.category.dialogApplyCategoryLayoutToActivities.risk') }}
+    </p>
+
+    <v-list two-line subheader>
+      <v-list-item>
+        <v-list-item-content>
+          <v-list-item-title>
+            <i18n
+              class="font-weight-medium"
+              path="components.category.dialogApplyCategoryLayoutToActivities.templateForNewActivities"
+            >
+              <template #categoryShort
+                ><CategoryChip :category="category" dense
+              /></template>
+            </i18n>
+          </v-list-item-title>
+          <v-list-item-subtitle class="whitespace-normal">
+            {{ contentsSummary(category) }}
+          </v-list-item-subtitle>
+        </v-list-item-content>
+        <v-list-item-action class="justify-start">
+          <v-list-item-action-text>
+            {{
+              $tc('components.category.dialogApplyCategoryLayoutToActivities.lastChanged')
+            }}
+          </v-list-item-action-text>
+          <v-list-item-action-text>{{ updateTime(category) }}</v-list-item-action-text>
+        </v-list-item-action>
+      </v-list-item>
+    </v-list>
+
+    <v-divider></v-divider>
+
+    <v-list two-line>
+      <v-subheader class="justify-center black--text">
+        <v-icon>mdi-arrow-down-thick</v-icon>
+        {{
+          $tc(
+            'components.category.dialogApplyCategoryLayoutToActivities.applyToActivities'
+          )
+        }}
+        <v-icon>mdi-arrow-down-thick</v-icon>
+      </v-subheader>
+    </v-list>
+
+    <v-divider></v-divider>
+
+    <v-list two-line>
+      <v-list-item-group v-model="selectedActivities" active-class="red--text" multiple>
+        <template v-for="activity in activities">
+          <v-list-item :key="activity._meta.self">
+            <template #default="{ active }">
+              <v-list-item-action>
+                <v-checkbox :input-value="active" color="primary"></v-checkbox>
+              </v-list-item-action>
+              <v-list-item-content>
+                <v-list-item-title>
+                  <CategoryChip
+                    :category="activity.category()"
+                    class="mr-1 flex-shrink-0"
+                    dense
+                  />
+                  {{ scheduleEntryNumbers(activity) }}
+                  {{ activity.title }}
+                </v-list-item-title>
+                <v-list-item-subtitle class="whitespace-normal">
+                  {{ contentsSummary(activity) }}
+                </v-list-item-subtitle>
+              </v-list-item-content>
+
+              <v-list-item-action class="justify-start">
+                <v-list-item-action-text>
+                  {{
+                    $tc(
+                      'components.category.dialogApplyCategoryLayoutToActivities.lastChanged'
+                    )
+                  }}
+                </v-list-item-action-text>
+                <v-list-item-action-text>
+                  {{ updateTime(activity) }}
+                </v-list-item-action-text>
+              </v-list-item-action>
+            </template>
+          </v-list-item>
+        </template>
+      </v-list-item-group>
+    </v-list>
+
+    <template #actions>
+      <v-progress-linear
+        :active="progress !== null"
+        :value="progress"
+        absolute
+        bottom
+        color="red"
+      ></v-progress-linear>
+    </template>
+  </DetailPane>
+</template>
+<script>
+import DetailPane from '@/components/generic/DetailPane.vue'
+import { campRoleMixin } from '../../mixins/campRoleMixin.js'
+import CategoryChip from '../generic/CategoryChip.vue'
+import camelCase from 'lodash-es/camelCase.js'
+import { errorToMultiLineToast } from '../toast/toasts.js'
+
+export default {
+  name: 'DialogApplyCategoryLayoutToActivities',
+  components: { CategoryChip, DetailPane },
+  mixins: [campRoleMixin],
+  props: {
+    category: { type: Object, required: true },
+    camp: { type: Object, required: true },
+  },
+  data() {
+    return {
+      dialogOpen: false,
+      selectedActivities: [],
+      progress: null,
+    }
+  },
+  computed: {
+    activities() {
+      return this.camp
+        .activities()
+        .items.filter(
+          (activity) => activity.category()._meta.self === this.category._meta.self
+        )
+    },
+  },
+  methods: {
+    camelCase,
+    scheduleEntryNumbers(activity) {
+      if (this.category.numberingStyle === '-') return ''
+      return activity
+        .scheduleEntries()
+        .items.map((scheduleEntry) => scheduleEntry.number)
+        .join(', ')
+    },
+    contentsSummary(activityOrCategory) {
+      return (
+        activityOrCategory
+          .contentNodes()
+          .items.map((item) =>
+            this.$tc('contentNode.' + camelCase(item.contentTypeName) + '.name')
+          )
+          .join(', ') ||
+        this.$tc('components.category.dialogApplyCategoryLayoutToActivities.noContent')
+      )
+    },
+    updateTime(activityOrCategory) {
+      return this.$date().format(this.$tc('global.datetime.dateTimeLong'))
+    },
+    async apply() {
+      console.log('you did it!', this.selectedActivities)
+      this.progress = 0
+      const step = 100 / this.selectedActivities.length
+      const selected = [...this.selectedActivities]
+      for (const index of selected) {
+        const activity = this.activities[index]
+
+        await this.api
+          .href(this.api.get(), 'activities', {
+            id: activity.id,
+            action: 'reset_contents',
+          })
+          .then((url) => this.api.patch(url, {}))
+          .catch((e) => {
+            this.$toast.error(errorToMultiLineToast(e))
+          })
+          .finally(() => {
+            this.progress += step
+            this.selectedActivities = this.selectedActivities.splice(1)
+            activity.$reload()
+          })
+      }
+    },
+    close() {
+      this.dialogOpen = false
+      this.selectedActivities = []
+    },
+  },
+}
+</script>
+<style scoped>
+:deep(.v-chip__content) {
+  width: 100%;
+}
+</style>
diff --git a/frontend/src/locales/de.json b/frontend/src/locales/de.json
index 4c0834874f..38ca910df9 100644
--- a/frontend/src/locales/de.json
+++ b/frontend/src/locales/de.json
@@ -211,9 +211,20 @@
     "category": {
       "categoryTemplate": {
         "contents": "Inhalte",
-        "createLayoutHelp": "Hier kannst du die Vorlage für neue {categoryShort}-Blöcke definieren.{br}Blockinhalt & Layout bereits erstellter {categoryShort}-Blöcke, werden nicht angepasst.",
+        "createLayoutHelp": "Hier kannst du die Vorlage für neue {categoryShort}-Blöcke definieren.{br}Blockinhalt & Layout bereits erstellter {categoryShort}-Blöcke, werden nicht automatisch angepasst. {applyToActivities}",
         "layout": "Layout",
         "noTemplate": "Keine Vorlage"
+      },
+      "dialogApplyCategoryLayoutToActivities": {
+        "applyToActivities": "Layout und Inhalte der folgenden Aktivitäten überschreiben",
+        "confirmApply": "Aktivitäten überschreiben | 1 Aktivität überschreiben | {count} Aktivitäten überschreiben",
+        "description": "Du kannst das Layout und die Inhalte von {categoryShort} auf Aktivitäten übertragen.",
+        "lastChanged": "Zuletzt geändert",
+        "noContent": "Kein Inhalt",
+        "replaceActivityContents": "Aktivitäten überschreiben",
+        "risk": "Jegliche bereits erfasste Inhalte in der Aktivität gehen dabei unwiderruflich verloren. Fahre nur fort wenn du dir sicher bist.",
+        "templateForNewActivities": "Vorlage für neue {categoryShort}-Blöcke",
+        "title": "Auf Aktivitäten übertragen"
       }
     },
     "checklist": {
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index 26c2e8c2eb..1e3caa9fc4 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -211,7 +211,7 @@
     "category": {
       "categoryTemplate": {
         "contents": "Contents",
-        "createLayoutHelp": "Here you can define the template for new {categoryShort} activities.{br}The content & layout of already created {categoryShort} activities will not be adjusted.",
+        "createLayoutHelp": "Here you can define the template for new {categoryShort} activities.{br}The content & layout of already created {categoryShort} activities will not be automatically adjusted. {applyToActivities}",
         "layout": "Layout",
         "noTemplate": "No template"
       }
diff --git a/frontend/src/locales/fr.json b/frontend/src/locales/fr.json
index a51ca2d1e2..cb0e3c19cf 100644
--- a/frontend/src/locales/fr.json
+++ b/frontend/src/locales/fr.json
@@ -211,7 +211,7 @@
     "category": {
       "categoryTemplate": {
         "contents": "Contenus",
-        "createLayoutHelp": "Ici, vous pouvez définir le modèle pour de nouvelles activités {categoryShort}.{br}Le contenu et la mise en page des activités {categoryShort} déjà créées ne seront pas ajustés.",
+        "createLayoutHelp": "Ici, vous pouvez définir le modèle pour de nouvelles activités {categoryShort}.{br}Le contenu et la mise en page des activités {categoryShort} déjà créées ne seront pas ajustés. {applyToActivities}",
         "layout": "Layout",
         "noTemplate": "Pas de modèle"
       }
diff --git a/frontend/src/locales/it.json b/frontend/src/locales/it.json
index 0abde0d6eb..26eeea9351 100644
--- a/frontend/src/locales/it.json
+++ b/frontend/src/locales/it.json
@@ -176,7 +176,7 @@
     "category": {
       "categoryTemplate": {
         "contents": "Contenuti",
-        "createLayoutHelp": "Qui puoi definire il modello per le nuove attività {categoryShort}.{br}Il contenuto e il layout delle attività {categoryShort} già create non verranno modificati.",
+        "createLayoutHelp": "Qui puoi definire il modello per le nuove attività {categoryShort}.{br}Il contenuto e il layout delle attività {categoryShort} già create non verranno modificati. {applyToActivities}",
         "layout": "Layout",
         "noTemplate": "Nessun modello"
       }
diff --git a/frontend/src/locales/rm.json b/frontend/src/locales/rm.json
index 10f235f61b..d614c6164f 100644
--- a/frontend/src/locales/rm.json
+++ b/frontend/src/locales/rm.json
@@ -135,7 +135,7 @@
     "category": {
       "categoryTemplate": {
         "contents": "Cuntegns",
-        "createLayoutHelp": "Qua pudais vus definir il project per novas activitads da {categoryShort}.{br}Il cuntegn ed il layout ch'èn gia vegnidas fatgas da {categoryShort} na vegnan betg adattads.",
+        "createLayoutHelp": "Qua pudais vus definir il project per novas activitads da {categoryShort}.{br}Il cuntegn ed il layout ch'èn gia vegnidas fatgas da {categoryShort} na vegnan betg adattads. {applyToActivities}",
         "layout": "Layout",
         "noTemplate": "Nagin model"
       }
diff --git a/frontend/src/views/camp/category/Category.vue b/frontend/src/views/camp/category/Category.vue
index 8373e97118..44f82c170e 100644
--- a/frontend/src/views/camp/category/Category.vue
+++ b/frontend/src/views/camp/category/Category.vue
@@ -71,7 +71,7 @@
           </v-expansion-panel-header>
           <v-expansion-panel-content>
             <CategoryProperties
-              :key="category"
+              :key="category._meta.self"
               :category="category"
               :disabled="!isManager"
             />