Jobfully has some good tips on how to "feel comfortable and confident while networking."
The best tip I found to help my own efforts were to consider the networking event space as your own home.
What has that got to do with networking?
When you host a party and a friend brings someone over that you haven't meet before how do you behave? It is your house, you are on your own turf, you welcome the person and make them feel at home.
Why not walk into the networking event room as feel the same way? You are the master. Find someone to welcome and get started . Before long, it will be easy to work a crowd.
Well maybe not easy, but certainly easier! The key is in your mind set, the key is starting with one person.
Have you found something that has worked for you?