SKOWHEGAN — A painting of birch trees in the fall will be raffled at River Roads Artisans Gallery. The raffle will begin with the gallery’s first holiday event — an open house from 10 a.m. to 7 p.m. Saturday, Nov. 12. The drawing will be held Saturday, Dec. 17, at Man Day River Roads special event for shopping by men. Proceeds will benefit the Somerset County Teen Pregnancy Prevention Program.