I think they used psychosis' wig and a plastic Kane mask.
Vince: Glenn, did you bring the mask and wig?
Kane: No, I couldn't find it.
Vince: Well, SHIT! Wait, I think I see a kid about three rows back wearing a Kane mask, someone go get it! And, uhhhh.... PSYCHOSIS!
Psychosis: Yeah?
Vince: I need your wig!
Psycho: But it's attached to the mask!
Vince: Who gives a shit? Ever hear of scissors?
Psycho: