On Friday, the Cross Insurance Center hosts the Hairball, a night of ‘80s hair metal with costumes encouraged, set for 8 p.m. in the ballroom. There’s also the first of several holiday craft fairs set for Saturday and Sunday at the Bangor Mall, featuring hundreds of vendors selling Maine-made wares all day. In Orono, Ten Bucks Theatre Co. presents its annual 24-Hour Play Festival, in which participants have 24 hours to write, rehearse and produce a brand new play; performances are set for 7 p.m. Saturday at Minsky Recital Hall at the University of Maine. And on Sunday in Waterville, the legendary Elvis Costello performs at 8 p.m. at the Waterville Opera House.