Abbey,
For my large school dances, I use a combination of my 14' truss, 2 video screens, and a chauvet 4-bar.
My 14' truss consists of:
6 ADJ mighty scans
2 elation UV-washes
2 chauvet colorpallettes
1 ADJ Galaxian 3D
2 moonflowers
2 ADJ Vertigos
1 Adsco Linedancer
1 16" mirror ball
2 ADJ led pin spots
I also use a chauvet 4-bar for "backfill" colorwash on the far side of the dancefloor
I also use 2 5'x7' screenworks rear projection screens for video and live dancefloor vid cam action
I hope this helps