DD - That is a hard position to be in. I don't know what I would do either... and would probably decide soon before the trip based on how "strong" I'm feeling in my sobriety. I have to travel for work at the end of this month and will meet-up with some old friends. I think I'll only tell them if it comes up and make sure I have water or soda water in-hand, a security blanket of sorts.
It's so easy to slip back into it. And amazing how persuasive that voice can be.