Events on rec.net
Upcoming events on rec.net can be scheduled by any player.
Featured events are usually announced on the official Rec Room Discord in #events or #announcements, as well as on posters within in the Rec Center and/or Dorm Room. The most common featured events have been Dev Q&As but recently video AMAs (with questions from reddit) were more common (probably because Against Gravity has been busy with porting Rec Room to Oculus Quest).
Maker Pen Classes
Maker pen classes are scheduled weekly on rec.net usually by Meriesa in ^MakerPenClassQandA. You can find @makerpenclass on Twitter and Instagram and the channel #makerpen-class on Meriesa's RecRooom ART discord.
Paintball League Events
See the Rec Room Paintball League website.