In DC, the Washington Area Bicycling Association provides free bike parking for major events on the National Mall. I think they also have tried to make it easy to bike to baseball games and other events at Nationals Park, in terms of designated bike routes in the area and bike racks at the park. I honestly don't know how much these things are promoted to the general population.
Capital Bikeshare is very popular in DC and it continues to grow in the near-in suburbs, so I imagine people will use that to cycle to major events in the area.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles