Younger sister got blackout drunk and ruined my evening, how do I get over it?

I went to a concert with friends recently and my sister (almost 40 adult) got blackout drunk. I did not make it into the concert due to the blacking out and instead was in the med tent with her.

This was my first time ever witnessing someone be non responsive and needing medical intervention due to drinking. Things happen and it was obviously a mistake. I was rightly scared and concerned.

Yes, it is something that happened recently so that may be the reason I am having a hard time moving past it and putting it behind me. But any suggestions on how to move on would be welcome.

Younger sister got blackout drunk and ruined my evening, how do I get over it?
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