I'm looking for a venue for a 30th birthday party in Cambridge... any recommendations? Ideally I'd like a private room in a bar or pub. I'm aiming for a medium-sized party, probably around 30 people, so I need enough space for them but not a huge room that could look empty. (My biggest fear is hiring a huge hall and no-one turns up!) Ideally we'd be able to play our own music - if not I'd want the venue to have a good DJ. And good cocktails. Food isn't essential... Thoughts?