I'll start by talking about myself, an SEE, even though some have disputed this already . sadface.
Anywho....
When I'm at a large party, I'll first show up and tend to greet EVERYONE. I'll start off by shouting at my few closest friends who I'm most comforatable with, then work around the room saying hello to all the lesser relations. Then I'll usually finish up the introduction phase by introducing myself to the people I haven't met who seem interesting and aren't really socializing much/look like they're having an awkward time.
After that, I like to grab a drink or two, and find something in the environment I can interact with, usually in a novel/unusual way to make people laugh. I act like people aren't watching me, but I know they are. I usually reward those who laugh at me by going over and talking to them more and entertaining them.
After I get bored of the above activities, I'll usually get a little bit more "introverted", in the common usage of the term, and find 1 or 2 people to have deep conversations with, usually about who they're dating/who they like/etc. I may change who I chat up at this point once or twice between my close circle.
I just lost track of what I was doing.....