Hey I just joined today so I have no idea about a lot of things, I assumed it was more than claymation but do think it's limiting name like a subculture within a subculture of animation haha.

I couldn't join stopmotionanimation.com says come back another time? I don't know if that's because of excessive members at capacity or something else?

I am in favour of all those suggestions I like dark themes and I'm pretty handy with design programs if you wanted help with any of it. I think URL is tricky stop motion magic sounds good but it is close to stopmotionanimation.com and does it cover puppets? do people do puppets here? Maybe that's another area? The whole concept of stop motion is magic to me so I think it's a great word to have in there whatever you go with.

I hope I'm not being that new person that posts a lot annoying veterans but maybe my perspective is good/fresh.

I had a brief look at the challenge section, I have seen similar concepts fail on other forums sometimes people are busy sometimes it's the same people over and over sometimes it's just the theme people don't want to be limited. I would suggest more open vague titles like WIP or Sketch/model battle maybe people pick a topic and someone does a concept for it then picks the next poster's theme? I dunno it is hard when it's a time consuming thing like puppet making you kind of want that long deadline but I would do away with it anyway it's hard work to maintain the energy of competitions better to have them once off occasionally I reckon.

I am mostly here to be inspired by people who are better than me at this stuff and read Q&A things, I think things that are easy to be involved in are best like "What equipment do you use currently?" "Favourite/inspiring films?" The more open ended and free the vibe is the more people will post and make a community it's when forums are being run by like a showrunner that it's hard especially for new people to partake.
I used to be on a music forum that slowly died, the only threads that refused to die were 'Post random shit for lols' and 'What are you listening to right now' I guess the equivalent here would be 'What are you into at the moment?'

So yea tl;dr version: Less is more, make it more accessible to newbies and a safe haven for sharing anything and asking questions