What an awesome community. It's amazing to see people offering space at their home so that you are able to park your car for free. Admirable group of individuals. If I were you, I'd definitely go a route like that. However, if where you want to be is not near any of their locations, I'd take a second to check out
Washington DC Parking | Find DC Parking with SpotHero They offer discounted parking and are scattered all over the city. Dependent on where you're staying, either would be a tremendous option.