Let's just say I know a lot of folks who also saw the u/s and who didn't go on a Monday.
Even if that were not the case, I have the absolute right to be peeved as would anyone who expects to see the artist when they are scheduled to appear. We went through a lot of hoops just to get those tickets changed (after they announced her performance schedule) and waited months with hopes we would see her performance. As a former performer I get that there are illnesses/holidays/etc.....but there are times as an audience member when it simply pisses me off. This was one of those times.