Help me solve the off-Broadway mystery. In the words of Max Bialystock: "It's a jungle out there!"

I don't know if anyone has tickets to Bill Irwin's upcoming THE REGARD EVENING at Signature Theatre, but regardless, I was wondering if someone could help me understand what's going on. I bought tickets for Wednesday night, and they just called me saying that the performance will be cancelled due to a supposed "illness" (do they have psychics working for them?) Anyway, they switched my tickets to Thursday night. Granted, opening night is Monday, for some reason there is NO performance on Tuesday and now Wednesday is cancelled. But if they switch all Wed tickets to Thursday, what happens to Thursday tickets? (and it snowballs from there.) The only thing I can imagine is that they are not selling out and are condensing the shows. Is this possible? Has this happened before? Freaking much? Yes, I know I'm insane...

That makes sense. But since Signature has suscribers, I'm surprised