In its third surprise show in the past week, Green Day will play the Fox Theater in Oakland’s Uptown tomorrow night, April 14. Tickets go on sale tonight at 5 p.m. The East Bay boys played a show at the Independent on April 7 and at the DNA Lounge April 9 in San Francisco. Both nights the band unveiled songs from its forthcoming new album, 21st Century Breakdown, which hits streets May 15. It’s a big year for the band, which, in addition to releasing the follow-up to 2004’s hugely successful American Idiot, will also stage a theater production of that effort at Berkeley Rep in September.