Enjoy Earth Day festivities at Jefferson Patterson Park and Museum. Activities throughout the day will include kite flying by the Calvert Optimist Club, tours of the Maryland Archaeological Conservation Lab and stargazing at sunset. Free refreshments and prizes. 11 a.m.-5 p.m. Saturday, Jefferson Patterson Park and Museum, Mackall Road, St. Leonard. Free. 410-586-8501.
A class for a child and a parent presents an informal musical experience -- not performance-oriented, developmentally appropriate for children and easy for parents. Open to children from newborns to 5-year-olds. The class will meet for eight weeks on Thursdays. 10:30-11:15 a.m., April 24-June 12. Charles County Department of Community Services, Port Tobacco. $65 for one child and parent; $32.50 for each additional child. 301-870-3388 or 301-934-9305.
WORKING WOMAN'S APPRECIATION DAY
Sponsored by the Charles County Chamber of Commerce, the event will feature a luncheon, a fashion show, a performance by Maurice J. McDonough High School's musical troupe the McDoNotes, and presentation of the chamber's annual Working Woman of the Year award. 8:30 a.m.-3:30 p.m. April 24. Greater Waldorf Jaycees Community Center, 3090 Crain Hwy., Waldorf. Members, $35; nonmembers, $45. 301-932-6500, 301-870-3089 or e-mail email@example.com.