I don't do parties. I am forced to go to social gatherings for special occasions.
After the painful entrance, where everyone says Hi and we have the fake "how are you" conversations where nobody really cares, I sit in a corner somewhere. Sometimes someone will come over and ask "hows work" (they don't really care, but feel the need to say something) or hows my horse (again, a one word answer from me, because I know they really don't care). Here is where my iphone comes in really handy, as I can look busy and avoid interaction.
I also get the "when are you getting married" (when we feel like it) and the when are you having kids (pls butt out of my personal life, kthxbye)
To make things worse, there are usually small kids running around, and often a baby. Woe betide the person who tries to get me to interact with the baby.
Then I wait for my OH to finish his socialness, (throw in a few "can we go now" looks here and there, while dreading the fake compulsory kiss and hug before being able to leave). Recently I've tried hanging back from people to avoid the kissy hug crap.
Walking through the door at home is such a relief after these social outings.