I generally avoid them altogether, as I typically find them neither "enjoyable," "fun" OR "relaxing." If I do have to attend an "obligatory" party-- work related, for example-- I pretty much have an idea of how long I am going to stay; I arrive, make myself "visible," and then leave.
But I'm an introvert. That doesn't mean I'm antisocial-- I like people just fine... I just happen to like my people ONE AT A TIME.