Bad Religion has played on Halloween only four times in their existence.
1982 - Fullerton, CA
The show took place at the Galaxy. The band opened for T.S.O.L. Jay dressed up as a "dead" Sid Vicious.
2009 - Philidelipa, PA
The show took place at the Wachovia Spectrum. The band opened for Pearl Jam. Jay dressed up in a skeleton suit. Greg & Eddie performed "Watch It Die." 
2010 - Atlanta, GA
The show took place at the Masquerade and was part of The Dissent of Man tour. Greg G. and Hetson dressed up as characters from the television show Jersey Shore. Greg G. as Mike "Situation" Sorrentino, Hetson as Nicole "Snooki" Polizzi. Brooks dressed up as Mike Muir, vocalist of Suicidal Tendencies.