Thanks match, and I agree. You're still not just out at a bar with buddies, you're there with people you've met at a professional event and the professional context should still apply. I think match says it well:

>when a group of people head out to the bars after conference hours there is plenty of networking going on. People form business relationships and friendships that continue after the conference. A female shouldn't have to choose to tolerate unwanted sexual advances simply to participate in these bonding experiences.