What do you suggest that I do at this party? I plan on at least acknowledging his presence and initially saying hello, but other than that I don't plan on engaging in any conversation with him. Is this the right approach? Or should I act as if and strike up a conversation with him?
Treat him like a friend. Acknowledge him, but I would not get mired down in conversation with him.
How many people will be there? Can you float around the party and strike up conversations with others, maybe even a few men...