Area high schools are teaming up for a vocal concert tomorrow. The Washington Concert Association has scheduled the event that will have mixed choirs from Mid-Prairie and Washington high schools. The choirs will be directed by Dr. Jon Hurty, professor of and director of choral activities at Augustana College. Over 100 students will perform at 7:30 p.m. at the Washington Community Theater. Adult tickets may be purchased at the door for $5.