In case you missed everyone talking about it...the Smithsonian Folklife Festival is going on right now. The full schedule of events can be found here.
9th Annual Old Dominion Beer Festival in Ashburn, VA will be occurring all weekend featuring more than 50 of the finest breweries in the country, as well as local restaurants, vendors and craftspeople. $12 entry fee includes festival glass. Beers are $1.00 per 6oz. serving. Full details here.
National Capital Barbecue Battle is going on Saturday and Sunday on Pennsylvania Ave between 9th and 14th streets. Tickets are $10 for adults and $5 for children.