Disney has released 2011 dates for Grad Nights at both Disneyland and Walt Disney World:
Disneyland Resort 2011 Event Dates:
5/12, 5/19, 5/26, 6/2, 6/8, 6/9, 6/16
Walt Disney World Resort 2011 Event Dates:
4/29, 4/30, 5/6, 5/7
See the video below for more info on Grad Nites