I wouldn't say anything. Think about this:
You coach a swim team, so you want to have an event and call it the "BBQ Pump Up." This pisses off some vegan mother whose child is on the team, so she gives you a list of vegan literature for you to read, followed by a rant on saturated fat and cholesterol, topped off with the ethics of consuming animal tissue.
Don't be that person. Just don't go. People are always going to eat pasta.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.