I have an upcoming wedding. I invited several of my best friends, all of whom are couples, to attend. But recently I found out that one of their mutual friends, who we do not know very well, is having a reception after coming back from their destination wedding on that same night. I also learned that this group of friends will most likely be leaving our wedding early to attend their other friend's reception. This is 3 or 4 couples, with about 80 total guests a our wedding.
I understand that they want to attend both, but I am worried they will only come to make an appearance at ours, stay for 30 minutes or an hour at our reception, not eat or drink anything, then leave for the next. Should I confront them? I'd almost rather them go after the ceremony, so we don't pay hundreds of dollars for them to be a virtual no show at our reception.