Wear a country dress and riding boots to Maryland Therapeutic Riding’s Derby Day benefit and watch the Kentucky Derby (6:24pm), bid in auctions and enjoy a buffet to benefit the program’s work helping people conquer physical, developmental and emotional challenges. 5-10pm at the farm, 1141 Sunrise Beach Rd., Crownsville: 410-923-6800; www.mtrinc.com.
Celebrate Southern Maryland traditions with antique boats and motors and master maritime carvers. Learn how to pick crabs, shuck oysters and stuff a ham and more at the eighth annual Solomons Maritime Festival. 10am-5pm at Calvert Marine Museum, Solomons: 410-326-2042; www.calvertmarinemuseum.com.
Get your car squeaky clean and benefit the Voices of Praise youth choir of Friendship United Methodist Church. 9am-1pm at Calvert-Arundel Medical Building, on the corner of Rt. 2 and Rt. 260. donations: 410-257-7133; firstname.lastname@example.org.
Feast on pancakes, bacon, scrambled eggs, sausage, home fries, toast, chipped beef and sausage gravy. 8-11am at Deale Fire Department, 6007 Drum Point Rd., Deale. $7 w/age discounts: 410-867-1350; www.deale42.com.
Enjoy food, live music, dancing, drinks, an auction and privateer mingling at Historic London Town and Garden’s annual Privateer Benefit. 6-10pm at the Gardens, Edgewater. $100; rsvp: 410-222-1919; www.historiclondontown.org.