I know my wedding E, but I lack real life skillz.
FMIL just graciously invited FSIL x 2, and myself to dinner (we are going shopping for their dresses together, and they are staying the night). She doesn't know that one of my bridesmaids is also coming with us. Would it be rude to ask her if the BM may also come?
I don't want to say, "Hey BM, go find something to do for an hour!" And I agreed to dinner before she asked me.