AFAIK NextCloud aims to replace something like Google Calendar, but this isn't exactly what I'm after. What I really need is something that replaces FB Events.

AFAIK NextCloud aims to replace something like Google Calendar, but this isn't exactly what I'm after. What I really need is something that replaces FB Events. I want to be able to create a distinct event, with like a page, time, and location where invitees can coordinate stuff, post pictures, etc. I'd then like for these events to be aggregated into a single place, which is the shared group calendar. Self-hosting a replacement for the GSuite would kind of solve this need, people could use Signal for chat and post pictures to NextCloud, but overall seems misaligned with the featureset I'm seeking.