Update with Data Umbrella events: Nov & Dec 2024 (#706)

* fix text description

* add video link for past event on polars

* add link to YT for upcoming event, and placeholder

* fix trailing spaces

* try removing YT link

* Fix linter

* Add YT link

---------

Co-authored-by: Brigitta Sipőcz <[email protected]>
Co-authored-by: Stefan van der Walt <[email protected]>

Author: 3 people

calendars/data-umbrella.yaml

@@ -2,12 +2,31 @@ name: Data Umbrella Events Calendar
 events:
   - summary: Introduction to Git
     description: |
-      A fortnightly meeting to share updates on everything
-      that is happening in the NumPy community. Everyone is welcome
-      to attend and contribute to a conversation.
+      Join us for an introductory session on Git. Discover some
+      fundamental concepts, explore its practical applications, and
+      learn how to efficiently use both the command line and the Visual
+      Studio Code graphical user interface (GUI).
 
       Meetup: https://www.meetup.com/data-umbrella/events/304521945/
       Webinarlink: https://www.bigmarker.com/neo4j/Data-Umbrella-Webinar
+      Video: https://www.youtube.com/@DataUmbrella
     begin: 2024-12-10 17:00:00 +00:00
     end: 2024-12-10 18:00:00 +00:00
     url: https://www.bigmarker.com/neo4j/Data-Umbrella-Webinar
+
+  - summary: Polars & Narwhals - Understanding Expressions When You're Used to pandas
+    description: |
+      When it comes to dataframes, pandas is the go-to library for
+      many people. Yet Polars is taking the world by storm, and so
+      many data practitioners are curious about trying it out. There
+      is a learning curve though, as Polars introduces some concepts
+      which pandas users might not be familiar with. This talk is a
+      deep dive into one of those concepts (expressions) and will focus
+      on how you can understand them from a pandas perspective.
+
+      Meetup: https://www.meetup.com/data-umbrella/events/304005848/
+      Webinarlink: https://www.bigmarker.com/neo4j/Data-Umbrella-Webinar
+      Video: https://youtu.be/kPtUPe5Egak
+    begin: 2024-11-19 17:00:00 +00:00
+    end: 2024-11-19 18:00:00 +00:00
+    url: https://www.bigmarker.com/neo4j/Data-Umbrella-Webinar