How do I network at networking events?

I going to the Enactus Expo that's happening tomorrow (Jan 29) for my ENT101 class because my prof told us about one of the assignments being based on networking with actual people. I've never been to a networking event or done any networking before so I have no idea what to do. I'm also socially awkward, especially when it comes to the initial start of the conversation. Can I get some tips on how I'm supposed to network with the people at the event?