MCC will hold a community open house from 1 to 4 p.m. on Sunday, April 15, at the main campus on 8900 U.S. Hwy. 14 in Crystal Lake. The event is free and open to all. It will offer informative historical displays, a short welcome program at 2 p.m. and a free Second Sunday Concert series, featuring the MCC Concert Band and Choir, at 3 p.m. in the conference center auditorium.