Easier idea- Rock Band fanclub. Find any Dave and Busters or similar venue that has the Rock band arcade style Guitar Hero game (there's one in Irvine Spectrum), wait for someone to start playing, and descend upon them all at once and start cheeri...
Hmmm I like the idea of chalk outlines on the walk of fame... could we make them in the shape of the actual dead celebrities? Maybe use it as a way to highlight the ways that they died... you know kinda a cautionary tale.