dancefloor from 8-12pm? for how long you're in Europe? i havent heard of a place where a party starts before 1am. what i suggest is Saturday at Le Cedre on Badenerstrasse, reserve 2 large tables upstairs for mezze and some belly dancing girl. head on to Talacker Bar and reserve the huge sofa. it has music/dj on, you can be outside and inside as a group... good space for that. also what you can do is go to Hotel Bar. nice place, service, drinks, staff. eventually 20-30 peeps might be a bit crammed in.