The grad nites at Disneyland this year are scheduled for:

Thursday, May 10
Friday, May 11
Wednesday, May 16
Thursday, May 17
Friday, May 18
Wednesday, May 23
Thursday, May 24
Friday, May 25
Wednesday, May 30
Thursday, May 31
Friday, June 1
Wednesday, June 6
Thursday, June 7
Friday, June 8
Tuesday, June 12
Wednesday, June 13
Thursday, June 14
Tuesday, June 19
Thursday, June 21
Friday, June 22

Although these pre-registered event evenings will occur after the parks are closed to the public, some groups may have visits spilling over in to the regular operating hours of the days before, during, and after the special celebration. Plan your visits accordingly if this is a concern for you.