Add lunchmeeting to activities

src/en/activities/2025/lunchmeeting-with-kilian-valkhof.md

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+---
+title: Lunchmeeting with Kilian Valkhof
+date: 2025-04-10
+eventdate: 2025-04-11
+author: Edwin Martin
+summary: During this lunch meeting, Kilian Valkhof will talk about "Dialog from A to Z"
+categories:
+  - Lunchmeetings
+location: Online
+key: 2025-lunchmeeting-kilian
+---
+
+Friday April 11th is the day! The first Fronteers lunch meeting, with Kilian Valkhof.
+
+The lunch meeting is an online meeting during lunch that you can follow from behind your desk
+(but also from your couch or in the park).
+
+The guest, in this case Kilian Valkhof (@Kilian@mastodon.social), talks about a certain
+topic (this time **Dialog from a to z**) and afterwards you can discuss/chat about it.
+
+The meeting starts at 12:30.
+
+See [Lunchmeeting Meetup](https://www.meetup.com/fronteers-nl/events/307212733/).

src/nl/activiteiten/2025/lunchmeeting-met-kilian-valkhof.md

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+---
+title: Lunchmeeting met Kilian Valkhof
+date: 2025-04-10
+eventdate: 2025-04-11
+author: Edwin Martin
+summary: Tijdens deze lunchmeeting vertelt Kilian Valkhof over "Dialog van a tot z"
+categories:
+  - Lunchmeetings
+location: Online
+key: 2025-lunchmeeting-kilian
+---
+
+Vrijdag 11 april is het zover! De eerste Fronteers lunchmeeting, met Kilian Valkhof.
+
+De lunchmeeting is een online meeting tijdens de lunch die je kan volgen van achter je bureau
+(maar vanaf je bank of in het park kan ook).
+
+De gast, in dit geval Kilian Valkhof (@Kilian@mastodon.social), vertelt over een bepaald
+onderwerp (dit keer **Dialog van a tot z**) en daarna kan daarover gediscussieerd/gekletst worden.
+
+De meeting begint om 12:30 uur.
+
+Zie [Lunchmeeting Meetup](https://www.meetup.com/fronteers-nl/events/307212733/).