Some advice on events:

If you want an event to be successful, it's important to get behind it and push it as hard as you can. Tell people in game about it, post progress shots of model creation here, stuff like that. If you just float the idea in the thread it's probably not going to be successful.
Another thing I found when organizing events is that it's hard to get turnout for events that people can't make their anime girls cute for. No anime day had an extremely high non-participation rate. I think the goosebumps event will struggle for that reason - but it's not impossible if you get out there and shill your event.

Avatar events are in general harder to do nowadays since everyone has blender burnout. It takes a lot of effort to get people to dress up.