With every one of Yorkville Middle School’s 600 auditorium seats sold out for four consecutive performances of the 16th annual Prism Concert, Justin Heinekamp knows they could have sold out another show based on the calls for tickets he’s had to turn away.

A Yorkville man, recently a substitute teacher in District 115, faces solicitation of a child and criminal sexual abuse charges.

The new policy, which takes effect Jan. 1, is an effort by the district to reduce the chance of online threats and to help students focus on their school work.