I like the contest idea because it will get the kids involved right away.

You could call the contest: Future Home of ? Naming Contest. You can give away a year or six months of admission to the club or something similar if you're not charging admission.

In case you don't want to go that route, here are some ideas:

Sunny Side Dancing
Spinning Your Wheels
Two Millennia Dancing and Arcade
The Safety (a reference to safe place...)
Darcade (mix of Dancing and Arcade)
Arcancing (mix of Arcade and Dancing)

You could also use some landmark in the area as the basis of your name such Top of the Hill.