As nice as it sounds, I can't agree with this idea entirely. But that's just my opinion <3
I feel like there would be too many contests and events altogether, as well as progress with Updates and what not.
We already have some contests (like the preset contest which hasn't been happening in a while now, but probably will in the future).
Creating a map, even if it's just for a contest with a theme, takes up a lot of time. If you want to get it right.
Also, there probably won't be many people in the contest. They could say "oh I might join, I like creating maps!" or something similar, but to be honest, I don't think that many people will participate.
I appreciate the idea though! ^^