If the word 'networking' fills you with dread, you might be interested in this article, in which Stephen Furnari, via body language expert Vanessa Van Edwards, shares his survival tips.
The two main takeaways are: stand where people are exiting from the bar, and have a good conversation starter ready (such as 'working on anything exciting lately?').
I'm always a bit skeptical about adopting specific body language, such as the head tilt, but overall, there are some good ideas in there. As always, having a strategy for these stressful situations can help enormously.