I was the same way, and would make my self sick worrying over what I did, what I thought I did, and most terrifying, what I couldn't remember.
But you cannot change what happened. Many people at the fundraiser will have already forgotten about you, because they have their own lives to worry about. But the family and friends, they may remember. The only thing you can do to bridge the gap and build trust again, is to change. Sobriety will open the door to making those changes, where you can earn trust not only with them, but with yourself.