Some venues have large, light-colored surfaces which can be used to project
videos during the dance.  

Examples in video below: On May 3rd, 2008, at the Oak Marsh Country Club, Paul
had a request for "Billy Jean."  He aimed a projector at the tilted, split ceiling
across from the DJ table and projected the video of Michael at the Motown 25th
anniversary show.  Dancers danced along with the video projection.  
Photo below: Example of a video projection running continuously from social hour until
the end of the dance, near the bar, to the side of the dance floor.