Nine classes of skaters grind it out Saturday at the St. Mary's County Skate Park in Nicolet Park in the fourth contest of the 2005 Mid-Atlantic Skateboard Series, sponsored by Ledo Pizza. Registration begins at 8 a.m., with the competition running from 10 a.m. to dusk. Registration is $20; attendance is free. Nicolet Park is at 21777 Bunker Hill Dr., Lexington Park. 301-475-4200, Ext. 1800, or www.ledopizzaskateboardseries.com.
Chaptico Classic 10K, 5K
The 20th anniversary of the Chaptico Classic, a 10-kilometer and five-kilometer road race and five-kilometer walk to benefit Alternatives for Youth and Families programs, will be held Saturday. Registration is at 7 a.m. Racing begins at 8 a.m. at Christ Episcopal Church, 37501 Zach Fowler Rd., Chaptico. $30 registration fee. For applications, call 301-884-0312 or go to www.alternatives4youth.org.
Summer Meeting, Hoo-Hah
The Port Tobacco Players theater troupe is holding its annual Summer Meeting and Hoo-Hah at 3 p.m. Sunday at Wathen's Farm, 10130 Penns Hill Rd. in La Plata. The event is free, but attendees are encouraged to bring food to share. 301-932-6819 or www.ptplayers.com.