I've got to be at the DC Convention Center tomorrow morning at 9 am for Greenfest. I'm sort of on the fence about whether to drive the whole way, or park at New Carrolton, and take Metro the rest of the way. (How's parking at the Convention Center? $$? Scarce?)
If I do the Metro thing, how much time do you think I should allow for the train? I know trains don't run as often on the weekends and I'm a bit worried about being late.