Hmmmm.... Turns out I might be on the hook for spending that (belated birthday) weekend with the wife at the in-laws cottage. Now "not likely" unless SWMBO tells me otherwise.
EDIT: Her birthday is on Wed the 17th, and she plans on spending the whole week there. So if I take a vacation day on the 17th and join her at the cottage for a day, I'm good to go for the weekend.