It might help to consider how this is triggered: you're dwelling on the situation. You have to learn to think about things other than how people around you are reacting to you, due to your social anxiety.
Personally, I'm excessively anti-social, so I don't set a good example.
But recognizing that, because your an Aspie, you're hyper inquisitive, is a good start. In other words, set yourself up to succeed: before you go to the event, deliberately research a few topics of interest or personal use that you can think about at length and engage your mind with during the event. Even crib a few notes in your pocket if you need. Think about that stuff at the event, not how people around you are behaving or thinking or reacting to you (most of which you would find as irrelevant as 'who's that guy?' 'Are there more shrimp balls?' 'Drinks here sure are expensive'... and the usual flotsam that goes through the normal mind.
Take your mind off the source of the anxiety, which is others' perspective of you. Engage them personally, but when you're not talking to them, think about something else that's complex enough to keep you engaged and repetitive enough to stick in your head. Classical music is a good example, or poetry, or organizational planning.
Aspies have complex emotional responses to people because we don't have some of the inherent behavioral biases of others. THat in turn leads to the anxiety; by shutting out the source of the anxiety -- dwelling on how secure we are around others and how we fit in -- we can control it somewhat.
An anti-anxiety drug probably wouldn't hurt, either.