Grammy-winning guitarist and songwriter Jack White has announced a surprise concert at Denver’s 500-capacity Bluebird Theater, and tickets are on sale this afternoon. Passes for the concert, with opener Acid Mothers Temple, are on sale at 1 p.m. today via bluebirdtheater.net. Prices were not listed, but a note at the bottom of the Bluebird Theater page mentions that $25 student tickets are available.