Whoa dance floor.
The rooftop bar and happy hour are what set Clarendon Ballroom apart from other bars in the area. However, on the weekends the place is unbelievably crowded and the dance floor is overrun by fist pumping dance moves (think MTVs Jersey Shore). Stick to weekday happy hours on the rooftop. Avoid the weekend when it turns into a frat mixer.
Citysearch Editorial Review.
This expansive Arlington club with a ballroom and bar downstairs and rooftop deck is rented for weddings and private events on some Saturdays and throughout the week, but on most weekends it's one of the Commonwealth's most popular nightclubs whether there's a DJ or a live band.