I'm subscribed to the emails for living social and groupon for Washington DC and Philadelphia. I've taken advantage of some great deals. The 2 for 1 brunch at the Kennedy center's restaurant, Rooftop Terrace, was amazing. It's normally around $37 per person and includes a mimosa and every food you could want including great seafood, prime rib, international cheeses, etc. Definitely recommend subscribing to the email lists.