The floodlit 7s at Rosslyn Park is still good fun. You get the entertaining rugby, enjpoy a few drinks and some food, but without the thousands of morons in fancy dress doing Mexican waves, chucking their empty (or not empty) beer cups and holders, constant interruptions as people go to get more drinks or to the toilet, etc. It's basically like the old Middlesex 7s, not the new Tickenham IRB one, which I won't go to anymore as too many people are there for the all day drinking but not remotely interested in the rugby.
Hong Kong 7s is still the top of my wish list though