Oh, this sounds cool, +1 for adding Jellyfin (since I’m not using Plex).

What did the slides tell you that the website didn’t? I think the name speaks for itself but also the first sentence on the website gives a pretty good description imo: “The Libre Graphics Meeting is the annual meeting on Free/Libre and Open Source software for graphics.”

I use FitoTrack for this, another option is Opentracks and as the other person mentioned maybe Gadetbridge, but my Pebble only does step counting so not useful in my case.