» July 28: Bike Maintenance Basics, College Park REI, 7 p.m. REI hosts this free introductory class to teach new cyclists how to take care of your bike. These classes fill up quickly. Info: rei.com.
» July 30: Bike to the Beach, Washington, 4:30 a.m. The 100-mile charity ride takes cyclists from Gonzaga College High School to the Delaware shore. It is a fundraiser for Autism Speaks. Info: biketothebeach.org.
» Aug. 19 and 20: Mid-Amateur Championship, New Market. The Maryland State Golf Association tournament will be held at Holly Hills Country Club. Entry deadline is July 26. Info: msga.org.
» Aug. 23 to 27: Senior Amateur Championship, Country Club of Virginia, Richmond. Golfers will play 36 holes of stroke play to qualify for the 32 spots moving onto the championship. Entry deadline is Aug. 9. Info: vsga.org.
» July 31: Blue Crab Bolt, Gaithersburg, 8 a.m. This is the first of the three-race 10K trail-running series hosted by EX2 Adventures. The race will be in Seneca Creek State Park and takes runners through hiking trails, stream crossings, grassy fields and minimal pavement. Info: ex2adventures.com.
» July 31: Battle for Ballston 5k, Arlington, 8:30 a.m. The race, a fundraiser for Youth for Understanding USA, takes competitors through six Balltston neighborhoods. Info: active.com. » July 31: Friends of the W&OD 10k, Vienna, 6:30 p.m. The annual race is an out-and-back course from the Old Vienna Train Station to Hunter Mill Road. Info: marathoncharitypartners.org.
» Aug. 1: Culpeper Sprint Triathlon, Culpeper, 8 a.m. The triathlon starts in Mountain Run Lake Park with a half-mile swim, then heads to rural country roads for the 16-mile bike and 5k run. Info: setupevents.com.
» Aug. 8: Splash 'n Dash, Silver Spring, 7:30 a.m. Competitors will do a 300-meter pool swim at Martin Luther King Jr. Swim Center in White Oak, followed by a 5k run through the adjoining park and trail. Info: capitalsprints.com.