What band that was a support act on the initial, first leg of the "California" tour was formed in 2003?
California Tour:  Support acts on the initial, first leg of the "California" tour included A Day to Remember, and the All-American Rejects and All Time Low on certain dates. All Time Low: All Time Low is an American rock band from Towson, Maryland, a suburb of Baltimore, formed in 2003.
All Time Low