The Royal Berkshire Improv Troupe announces today their December performances. Saturday, December 12th the troupe will perform at Barrington Stage's Stage 2 in Pittsfield and Saturday, December 19th at Main Street Stage in North Adams. All shows are at 8 p.m. and tickets can be purchased at the door for $10. RBIT is a comedy improv group that has been delighting audiences with its own brand of non-scripted comedic mayhem since June of 2001. Performing a mix of theater games reminiscent of the TV show Whose Line Is It Anyway?, the group models its work on the teachings of renowned theater games/improvisation instructor Keith Johnstone. Through audience participation, RBIT's mission is to create entertaining scenes which explore the boundaries of theater improvisation.