Handling an upcoming event with N

Hello everyone
It's been a while since I've been here. The N (Reptile, or Dickhead, as I call him) has been out of my life since 2012. Since then I've done a lot of work on myself, have become reasonably good at spotting N's or other toxic people, and am learning (slowly) how to assert my own boundaries without feeling like some kind of monster. I'm also learning how to become more guarded generally, less friendly or open, but a lot more discerning. Goldie's one on one's were really helpful to me.

Tomorrow I'm going to a camera workshop, which I hope will make me more employable in the local film industry, and will help me get myself more known. However, after confirming I'd go, I found out that Dickhead will also be attending.

I've been running possible scenarios through my head in preparation, but really, I can't predict his behaviour, he was so manipulative and changeable.
Should I say "hello" for politeness sake, should I ignore him, should I avoid the event altogether?
I really wish he would not be there.