A public open house is being held this weekend at Central Wisconsin Christian School in Waupun following the largest expansion in school history. The open house will be held Saturday from 10am to 1pm. CWC director of advancement Gregg Zonnefeld says the expansion is necessary to meet increased student enrollment. The largest phase of the project will add nearly 15,000 square feet at the high school and 15,000 square feet of elementary classroom space. Future phases include new music classrooms and fine arts performance spaces, and an athletic complex.