I copied this directly from the Disneyworld Web site. I don't see any EMH Sat or Sun-May 3rd or 4th for Epcot to open early?? On the 3rd it's opening early, but remember the 5K is that day and mainly in EPCOT, I don't think it runs through Hollywood Studios??
If the web site is wrong I apologize.
May 2008
Morning Extra Magic Hours
Magic Kingdom ® Park May 1, 8, 15, 20, 22, 27, 29
Epcot® May 6, 13, 18, 25
Disney's Hollywood Studios May 3, 7, 17, 19, 23, 26, 30
Disney's Animal Kingdom® Theme Park May 10, 12, 21, 24, 28, 31
Blizzard Beach May 22, 29
Evening Extra Magic Hours
Magic Kingdom® Park May 4, 11, 18, 23, 25, 30
Epcot® May 2, 9, 16, 20, 22, 27, 29
Disney's Hollywood Studios May 5, 12, 21, 28
Disney's Animal Kingdom® Theme Park May 8, 14, 19, 26
Typhoon Lagoon May 24, 31