When I was a kid, eons ago, Admission Day was a state holiday and we would get the day off of school. I'm not sure when they got chintzy with the holidays, but there doesn't seem to be much interest.
Which is ironic, as Admission Day is at least one of the reasons Mexican Americans in California started making a big deal out of Cinco de Mayo, instead of Mexican Independence Day (Sept. 16th). Somebody
decided that Mexican Independence Day was too close to Admissions Day.
*shrugs* That's how I've always heard it.
Today is the 159th anniversary of California Statehood! :-)