May 5 is the day the are making the start of the 18 month long 50th anniversary of Disneyland and there are big events planned for all the parks. Also, as mentioned, Soarin' is opening as is Cinderellabration and Lights, Motor, Action Stunt Show....
You can get the dates right here on the Dis. Click here and scroll down lower on the page.
STAR WARS WEEKENDS
May 20, 21, 22, 27, 28, 29, June 3, 4, 5, 10, 11, 12, 2005
Special appearances from Star Wars characters, that roam the park greeting guests and taking photos with true Star Wars fans each weekend. The 2005 schedule has not been released. Star Wars Weekends