I guess when they pay you cash upfront for a gig, you have to show up no matter what shape you are in.
Maybe that's what happened to him here. He took cash up front for a gig before this one, but didn't show up for it. So a couple "collectors" paid him a visit with baseball bats and fucked him up when he didn't have the money. So he's probably playing this gig to pay them back before they kill this mom or something.