Saturdays is couples night plus limited singles at The Office. Single guys are limited to about 5 or 6, and must book in advance. Generally they only tend to let in ones they already know and trust. Saturdays can get quite busy with the number of couples. Most people that go seem to have a good time, although it is as much about making friendships than anything else. I think some people there swap phone numbers and arrange to meet and play at each others houses rather than at The Office itself - although some couples obviously do play there too.
Fridays is a more "greedy girls" type of night where the couples that come along want the attention of several single guys. Still, it is not a free for all - you must be friendly and courteous, get chatting to a couple and they may invite you to play, but if not then no still means no.
Dave.