

i’d say start small. do the the webpage on some old hardware, maybe a wiki. content consumption things that would be uncomplicated for the group to adopt. avoid things that would mean managing accounts for other people early on. a wiki or some static page using something like modocs will be easy to run off a decent internet connection at the building. low bandwith usage and low traffic.
if your goal is to degoogle group, nextcloud could be helpful for the organisers. maybe if you have success on the simple sites you can get people on board with some hardware for a small nextcloud server. but dont plan on opening the next cloud up to the kids. thats a world of risk you don’t need to open up.
meshcore is licensed the way you do it if you plan to go freemium down the road. its fine to use if your area has already gone that way. but meshtastic fits better in a foss standard and does the same thing.
either way you go its best to see these as fancy pagers not diy instant messagers. they have some great potential in a world where govs or nature can knock down cell service, if you’re purposeful and realistic about it. but they are not as easy to build as youtube would tell you. and they’re not gonna replace your phone full time.