Here's a recently announced show from the 9:30 Club website...

THU. AUG. 12
Bob Dylan and his band & Willie Nelson and friends
w/ The Hot Club of Cowtown
@ Ripkin Stadium • Aberdeen, MD
6:30pm Doors. Tickets on sale Saturday, June 26 @ Noon through Ticketmaster ($46).

That's a minor-league baseball stadium between DC and Baltimore. Sounds like a cool show.