On the National Mall if you are into jam bands or just chill music check it out on Sunday April 20th here is the link: http://www.greenapplemusicfestival.c...&Itemid=32

The bands I am looking forward to seeing: Gov't Mule, Umphreys McGee, The Roots (with a ton of special guests) & Toots and Maytals

There are a couple more bands that dont interest me as much but it should be an awesome concert for sure!