If you'd like to do something for Juneteenth, there is an upcoming run and a ride for the weekend of June 19-20. The run is on Sat and is a trail run if you'd like to try running past all the Civil War Defenses along I think the Fort Circle Park Hiker-Biker trail. I suppose you could bike it too! The ride is on Sun with a shorter "solidarity" ride as well as a longer one if you'd like to go all the way out to Potomac. All the events are free.