Looks really nice for it's niche.
I very recently started considering the options around and really wanna give a shot to the federated version called Mobilizon. It seems to be gaining quite some popularity according to the stats but it's mostly in Europe.
There is a US instance though with some decent amount of activity.
It's still a little rough around the edges but the devs (french nonprofit that made peertube) just got money to fix that up so I really hope they make good headway. I'm gonna start a group on there soon and hopefully that'll lead to some useful bug reports and feedback.
I switched all my events to Mobilizon and wont look back. It works really well. A few features are missing like recurring events but since it is FOSS, anyone can add it. Feel free to give it a shot.