Thru the website, the message shows up only when you click on one of those dates to buy tickets. (They weren't asking YOU to confirm an absence, but just to confirm you knew you were buying tickets for a date he was out.)
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.