Chuck H. answered 06/07/19
20+ Year Successful Business Executive
"Cold calling" at network events is a necessary evil, which when done correctly, can greatly boost your network and many different areas of your career. At many events you will find yourself at, you may not know anyone, so with your confidence up, you must be willing to put yourself out there.
In terms of what are effective techniques, the most basic thing to remember is that human beings enjoy talking about themselves. Ask questions of those you have just met; this will loosen them up and you will also enjoy the benefit of learning more about them. Those questions usually lead to points of connection between the two of you, and your conversation can grow from there.
Hope this helps and good luck!