@buherator I would personally put a *lot* of effort into making sure you have the choice to withhold your real name and email while still signing up. Generating an anonymous access code unique to the attendee seems like one possible way to do this. There are a lot of protest signup forms I've seen and I know these site designers mean well but I absolutely am not going to willingly put my name on a list for something like that connected to the internet while [gesturing wildly at everything]. I think that should be very much discouraged and anything designed to keep people in the loop should serve as a means of educating people about their right to privacy (and the manner in which that's effectively waived the minute they let someone have any of their info).
@buherator Hmm. I can't think of any off the top of my head. https://www.when2meet.com/ is one thing I've used before in a pinch to organize small events but I have no idea if there's a means of pushing notifications to burner emails with it, I can't remember. I don't think you can upload pictures either. But it ticks most of the good boxes, you don't have to make an account or anything like that.
This does get me to thinking, perhaps this is a niche that's not properly filled! Hopefully someone else has a better idea.
Edit: The whole reason I got excited and replied was because I for a moment thought you were offering to build such a thing!
I was once looking into using nextcloud for an event. I might have had different requirements, though. But it does have something like Google Docs, it has forms you can send, it has a calendar. I don't think it has the ability to do email lists, though. But it does have a privacy-respecting video conferencing thing, which has almost all the features you'd expect. The thing it doesn't have is auto captioning. Or even a way for a stenographer to display manual captions.
Another thing you might try is Mobilizon. It's a fediverse-equipped program for doing events. It can handle rsvps and all that. It can probably handle emailing rsvped folks better than next cloud can.
It doesn't have the whole document suite or video chat, but it seems like it might be better focused on the stuff you're interested in.
@buherator Hey! Check out Meetabit.com. Somewhat poular here in Finland
@buherator Recently I had to change ØxOPOSɆC (Porto Security Community) from Meetup to https://kommunity.com/ and so far so good. A lot of free features, intuitive UI, mailing list, event announcement and although we don't use you can upload the event materials for later reference. Paying a small fee you can get some more stuff like a zoom access.