Dillon Robbins as Professor Silas Snakebreath and Conner Ewing as Running Water this week rehearse for their roles in this weekend's performances of "The Snake in the Grass." Celina High School students will perform the play at 7:30 p.m. Saturday and at 3 p.m. Sunday. The show scheduled for tonight has been canceled because of Celina's playoff football game. Tickets can be purchased at the door or by calling 419-586-1494.