Run or walk along the Chesapeake for the fourth annual Recreation Deeds Challenge 5K Run and Fun Walk in memory of Tyler Hamerick and in honor of all adaptive athletes. Benefits Recreation Deeds, a non-profit for special-need athletes. All levels of ability welcome. Registration 7:45am; Run/Walk at 9am at Fort Smallwood Park, Pasadena. $24 w/age discounts; rsvp: 410-222-7315; www.aacounty.org/RecParks/recdeeds5krun0313.cfm.