Have you signed up to participate in Car Free Day yet? The big day is tomorrow, but as of this writing only 4,759 people have pledged to reduce or eliminate their car use for one day, well short of the 5,445 the event logged last year. You can find the Car Free Day online pledge form here. And don’t forget that from 11 a.m. to 3 p.m., F Street NW between 7th and 8th will play host to the big Car Free Day celebration, which will feature, among other things, a free outdoor yoga class from Yoga District at 1:30 p.m., a lesson on bicycle repair at noon, and a special bonus for Penn Quarter office workers: the Fojol Bros., the Spy Diner sidewalk food cart, and On the Fly will all be at the event to sell tasty food cart lunches to all comers.