I've got to say, a lot of your responses seem like you are pre-convinced that there isn't any solution to your problem. I think that's why you've been getting so much snark/pushback. (Are you looking for genuine help, or just needing to vent? Either way, it's ok. Separating the two might be beneficial to you though, that's all I'm saying here)

Did you read Schmorp's full story, or just the one link I sent? I know it's not step by step instructions, but if you're serious about organizing something I feel like there are a lot of good tips you could pick up on from the way that they did/are doing things.

Do you have any libraries you could frequent? Many of the unknowns you have could be addressed at a library and I think they would have much more relevant answers pertaining to your locality.

Also, here's a link to something that I just saw here, that seemed like it could be potentially relevant/useful: https://mobilizon.fr/