I dream of having an event at Reservoir Lounge. The intimate, dark setting is perfect for a group of about 100. The tapas-style menu is decent (rating above is for a late night out... dinner rating would be slightly lower), the drinks are good, although a little expensive, the staff is quick, but the music is so much fun. It's different every time I go - kind of jazz fusion - but always upbeat, great for dancing... loads of fun.
If you're not into dancing, you could probably sit in the corner and watch the crowd and have almost as much fun. It's a random, albeit interesting, clientele, and I could watch them all day. Are you one of those people who wonder what someone's husband/wife/bf/gf/sign. other/lover is like before you get the opportunity to meet them? Then this crowd will fascinate you!
If you're not into amazing music or crowd watching or great atmosphere... then go somewhere else - we don't want you here anyway.