How would you deal with an Antifa counter protest?

This is a real situation that will happen to me in less than 48 hours. I am here at WorldCon76 in San Jose. There is an alt-right protest that will be happening in front of the convention on Saturday (the reason for the protest is rather long and not relevent to this question). As I walk around San Jose I am seeing posters calling for counter protests by Antifa. It could get ugly.

My plan is to try to sneak into the convention center early by a side enterance but the potential for violence could get high.

How would you deal with a situation like this? I’m going to make the assumption that everybody hates Nazis, but how do you feel about Antifa protesters?

I’m a middle aged nonconfrontational guy who will try my best to avoid the whole thing. But how would you deal?