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ALSDEAD will not be performing at Sonic con this year because the con's site says that they have to cancel the band's performance.

"We have unfortunately had to cancel Alsdead’s performance at SONCION for this year. (If you have banquet tickets to their table we will email you). BUT…. there is a silver lining! PEELANDER Z & BOWLING FOR SOUP are now playng SONICON 2010!"
Don't worry, the band will surely make a comeback overseas! The fan Facebook page makes it positive to make them come back to the U.S.
"ALSDEAD at Sonic Con in Plano, TX November 5th through the 7th has been canceled. Please see www.alsdead.com as well as the band members’ individual Ameba blogs for more details. Be on the look out for more ALSDEAD updates regarding shows in the US. We’re working hard to bring them here still!!"
Source: shattered-tranquility.net