Just a thought, but how about if -- for your 40th weekend -- YOU made plans, for a "girls' cruise" or even just a "girls night out" with your female friends? Then, when it comes up again in context (and don't mention it until it does, or it will look "forced"), say "Oh, that. Well, when you told me about your plans, I made plans of my own, and me and (GF names) are going to Atlantic City (or whatever) for a girls weekend!"
