Mark Boulton wrote an awesome article on tips for conference organizers from a speakers perspective. My favorite is #9:
Alcohol. Again, this is personal, but not everyone likes a piss-up. So, the after party should not necessarily be at a club where you can’t hear yourself think with as much free spirits as you can drink. Consider attendees may want to talk amongst themselves in a grown-up setting after a long day sat down. We’re not all party-animals.
Count me in that category. I’d gladly choose an after-party at a coffee house over one at a bar any day of the week.