Same here. The good social situations, even large parties with lots of people, energize me immensely. Enough to sleep only 5 hours afterwards, and feel hyper-energized all day next morning. Kind of like a "I can move mountains!" feeling. These kinds of parties would be the ones with friendly people, some semblance of structure, a "come as you are" vibe, plenty of food, and unobstructed access to alcohol. That's where I feel like king of the world, if all goes well. All combined with a good way to pass time when you're drunk. Be it music to dance to (with a lady, even), a lively atmosphere for blowing off steam, or just a patio for getting some quiet time and fresh air.
Unfortunately, my friends' parties tend to be an aspie's worst nightmare. They're very sedate, with a strict unwritten social hierarchy, based on the longevity of your current relationship. I stay away for that very reason.