So, how do I apply...I'm accepting your decisions and behaving accordingly...in this situation?

Nephew dropped off the ticket to his graduation. I accept the ticket and come back inside for a bit to eat. A couple hours later, it dawns on me.

AP's son is also a member of the graduating class and will be at graduation on Thursday. How did I totally forget this critical detail? I'm now not sure that I can attend. What would I do if I crossed paths with her? Her mom?

I suspect H and AP won't be sitting together as their relationship is still a secret. But even that is a possible interaction that I'll encounter.

I'm in a bind. Do I attend graduation?

If I don't, my D will be so uncomfortable going alone.

What is the recommendation? Do I attend? If I do attend, what do I do when I run into her? Cross paths with her?