Update DataFusion meetups page on docs (#20629)

## Which issue does this PR close?



## Rationale for this change

It was mentioned it is hard to find out about new events
[link](https://www.linkedin.com/feed/update/urn:li:ugcPost:7433220719607545856?commentUrn=urn%3Ali%3Acomment%3A%28ugcPost%3A7433220719607545856%2C7433309539426504705%29&dashCommentUrn=urn%3Ali%3Afsd_comment%3A%287433309539426504705%2Curn%3Ali%3AugcPost%3A7433220719607545856%29)

<img width="584" height="458" alt="Screenshot 2026-03-01 at 7 26 16 AM"
src="https://github.com/user-attachments/assets/4807d2c1-8c4a-488b-a6a6-4fb9eafc67b1"
/>


## What changes are included in this PR?

Add links to the various meetups that are scheduled in the next fe
months to the webpage

I made them with codex using this prompt and then checked all the links

<details><summary>Details</summary>
<p>



```text
› I would like to update the contents of the page ./docs/source/user-guide/concepts-readings-events.md

  This is published here https://datafusion.apache.org/user-guide/concepts-readings-events.html

  Specifically, let's first update the list of events with more recent ones. To do so, please look at the discussions here https://github.com/apache/datafusion/discussions

  Please use the `gh` command to fetch the contents of github discussions and issues when necessary

  For example, here is a recent event: #19859 in San Francisco that should be on the events page

  There are also events scheduled in Stockholm, Denver, Seattle, in the next few months that should be on there

  There are also seveal in the past
```


</p>
</details> 

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## Are there any user-facing changes?

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Author: alamb

docs/source/user-guide/concepts-readings-events.md

@@ -192,6 +192,13 @@ This is a list of DataFusion related blog posts, articles, and other resources.
 
 # 🌎 Community Events
 
+- **2026-07-22** [Denver Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/18428) - [RSVP](https://luma.com/jsu6faie)
+- **2026-05-12** [New York City Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/20030) - [RSVP](https://luma.com/adhshv92)
+- **2026-04-23** [Seattle Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/13500) - [RSVP](https://luma.com/hxshbp0m)
+- **2026-03-05** [Stockholm Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/18429) - [RSVP](https://luma.com/ctqtiqap)
+- **2026-02-19** [San Francisco Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/19859) - [RSVP](https://luma.com/p7r6fp2z), [Recording](https://www.youtube.com/playlist?list=PL42Ljm2tTt5peGUWMBN7WFkASq73j8PoU)
+- **2025-11-12** [Boston Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/16703) - [Recording](https://youtu.be/wCAud478Dg8), [Slides](https://drive.google.com/file/d/18KGH_wGHkgdAfjy5sQVKFhnN1GyYXSzU)
+- **2025-09-15** [New York City Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/16265) - [RSVP](https://lu.ma/qkcyycg0), [Recording](https://youtu.be/ElAiN_1fX_4)
 - **2025-01-23** [Amsterdam Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/12988) - [Slides](https://github.com/apache/datafusion/discussions/12988)
 - **2025-01-22** [Datadog Apache DataFusion Community Meeting](https://www.linkedin.com/posts/seshendranalla_apache-datafusion-community-meeting-2025-activity-7290384383201435648-8tqv) - [Recording](https://www.youtube.com/watch?v=ceTo2vUyRI0)
 - **2025-01-15** [Boston Apache DataFusion Meetup](https://github.com/apache/datafusion/discussions/13165) - [Slides](https://docs.google.com/presentation/d/1_zBLHdqxPlhWuNK2oCA2d_hCpb6HWgHbVJBseiUXA80)