I can't attest to the New Year's scene in Clarendon because I was at Mie N Yu in Georgetown. The upscale Middle East / Far East fusion restaurant was very impressive and wrapped us in a rich and classy mood to bring in the new year. Entertainment came by way of belly dancers and a terra cotta warrior performer.
Mie N Yu offered a special NYE's menu for the night to simpify orders: either a Middle East or Far East selection in 3 or 5 course. Both were excellent in presentation and delicious, although of course portions are small and expensive (the soup was served in shot glass size for instance). I really enjoyed the Afghan style lamb from the Middle East dinner.
Street parking is limited of course and the metro is a long walk, so either grab a cab or park in the Colonial lot one block east for $18.
Highly recommended for a fun and classy night out!