Sundance Racing Festival: Land &/or Sea. Variety of events including a 5K run, 1-mile walk, ½-mile swim, swim-and-run biathlon and a “sashay” in which participants are invited to walk a catwalk in full costume. 8 a.m. on the boardwalk near the bandstand in Rehoboth Beach. (Swimmers meet at the bandstand at 7:30 a.m.) Benefits CAMP Rehoboth, which will host an after-run party. Info: seashorestriders.com.
Last Blast Labor Day Prediction 5K. Runners predict their times; top 20 predictions win prizes. No watches, mile markers or clocks. 7:30 a.m. at Grove Park, Rehoboth Beach. Info: seashorestriders.com.
Summer’s End 5K, 8 a.m. at Jimmy’s Grille, Dewey Beach. Info: races2run.com.
Rylie’s Dog Days of Summer 5K, at the American Legion Post 17, Lewes. 8 a.m., kiddie race starts at 7:45 a.m. Benefits Rylie’s Smile Foundation, which provides iPod Touch devices to children who are facing life-threatening diseases. Info: races2run.com. For information about Rylie’s Smile: ryliessmilefoundation.org.
Run, White and Blue 5K. 6 p.m. at Delaware Technical Community College, Georgetown. Includes a 1-mile walk. Benefits the campus’s Veterans and First Responders Scholarship. Info: seashorestriders.com.
Gary P. Lister Bottle & Cork 10-Miler/5K. At the Bottle & Cork, Dewey Beach. 7:30 a.m. Benefits Dewey Beach Patrol, the Tyanna Foundation, which raises money for breast cancer research, and the Sussex Consortium. Info: races2run.com.
Cannonball 5K Run and Trenny Elliott Memorial Walk. 8:30 a.m. at the Lewes Historical Complex. Routes will go through historic Lewes. Sponsored by the Lewes Historical Society. Info: 645-7670 or historiclewes.org.
Dewey Beach Sprint Triathlon. Half-mile swim, 15-mile bike ride and 3.5-mile run. Other options include the duathlon: half-mile beach run, 16-mile bike ride and 3.45-mile run; and the aquabike: half-mile swim and 16-mile bike ride. Triathlon can also be run as a relay. At Delaware Seashore State Park, south of Dewey Beach, starting at 8 a.m. Info: deweybeachtriathlon.com.
Hustle for the House 5K, to benefit the Ronald McDonald House of Delaware. 8:30 a.m. at Irish Eyes restaurant, Lewes. Info: rmhde.org.
Giggle Medic 5K run. 8:15 a.m. at the Greene Turtle near Lewes. Also a 1-mile non-competitive walk. Benefits the Stephanie Callaway Memorial Scholarship. Info: races2run.com.
September 21 through 23
Bethany Beach First Responders Sports Weekend. Includes a half-marathon, which can be run as a relay, triathlon (swim, bike and run), duathlon (run, bike and run), aquabike (swim and bike) and a 5K run. Benefits the Bethany Beach Volunteer Fire Company. Events all begin and end in downtown Bethany. Info: bethanybeachtri.com.
Paradise Crushin’ Cancer 5K run. Noon at Paradise Grill, Long Neck. Post-race party will feature Mike Hines and the Look. Info: seashorestriders.com.
Taste of Sposato Wine 5K. 9 a.m. at Sposato Landscape Co. near Milton. Benefits the Sposato Family Vineyards Scholarship Fund. Info: seashorestriders.com.
Run for Betty Dolphin Dash 5K Run, at Shields Elementary School, Lewes. 5:30 p.m. Youth dashes start at 5 p.m. Benefits the Betty Gooch Scholarship. Info: seashorestriders.com.
Udderly Fun Mooo-Run. 9 a.m. at Hop-kins Farm, Route 9. The farm’s creamery will be open following the run. Info: seashorestriders.com.
Dogfish Dash 8K, 9 a.m. at Dogfish Head Craft Brewery, Milton. Benefits the Delaware chapter of the Nature Conservancy. Info: dogfish.com/events/2018-dogfish-dash.