You Can’t Sit Here, an original children’s opera from Eastport Arts Center’s Music for Children project, will be presented for 5th through 8th grade students from 15 local schools at the end of this month, followed by an evening performance for the public, Friday, March 29, at 7 p.m., at Eastport Arts Center. The characters are students at a small elementary school who experience loneliness, anger, and frustration in reaction to bullying, isolation, loss of status, and school mores.