The high school that sends the most students throughout the season to hear the Chicago Symphony Orchestra at Ravinia Festival will receive a cash donation from Ravinia. Best of all, lawn admission is free to all these students. They simply need to show their student ID at the box office so a point can be recorded for their school. To make things fair, the points will be weighted on a map of concentric circles, so the students who travel furthest get more points than the students closest by. All students will win double points when they attend the second annual “Cannonball,” a hang-out with free food and refreshments prior to the July 29 all-Tchaikovsky concert. That concert features live cannon explosions in the “1812” overture. For information, register at the facebook page.