CSM Student Association Community Yard Sale. 8 a.m. to 12 p.m., March 12, College of Southern Maryland, Prince Frederick Campus, 115 J.W. Williams Road, Prince Frederick. The College of Southern Marylands Prince Frederick Campus Student Association is hosting a community yard sale to benefit Project Echo, Calvert Countys homeless shelter. Tables to display sale items can be rented for $10 each. Entrance to the event is free. To reserve a table, contact Ricardo Perez at 443-550-6020 or email@example.com.