Sunday's installment of the Trivia Mafia (aka Chuck & Sean's Trivia) at the 331 Club will be a special one. To mark their fourth anniversary, the lords of useless facts and Monday hangovers are bringing in celebrity guest Dessa, whose daunting task will be answering questions about herself. Dessa's pal P.O.S. was the guest last year for the third anniversary and reportedly got skunked. The event is hosted by Sean McPherson of Heiruspecs fame (and Dessa's band) along with Roger Waters' best friend in the Twin Cities, Chuck Terhark. McPherson will also take part in a game of Hip-Hop Charades on Sunday with Carnage and No Bird Sing's Eric Blair. All the usual trivia fun will be going on, too. It starts at 8 p.m., and it's free.

The Mafia dudes will then move on to the Vita.mn Trivia Cup on Wednesday at Gluek's.