Article from the LA Times (subscription required) - May 6, 2005
Disneyland Marks Its Big 5-0

Some devotees of the amusement park camp overnight to be a part of the official start of the celebration.

Beneath drizzling skies that even Walt couldn't have controlled, Disneyland launched its 50th anniversary celebration Thursday, drawing a crush of fans and underscoring the enduring magic of the cultural landmark.

Some camped overnight in their cars. Thousands had lined up by the time the park opened at 8:30 a.m. Youngsters pressed their faces against the wrought-iron gates to steal glimpses inside.
More people crammed into the park in the first three hours by some estimates about 35,000 than on Disneyland's opening day, July 17, 1955.
But Thursday, the focus was on Disneyland, where 1,200 media personnel covered the likes of Aladdin arriving on a camel, Stitch being escorted by Anaheim motorcycle officers, and Goofy and Mickey driving up in Herbie the Love Bug.