my Spider-man opening night tickets (Mar 15) CANCELLED by Ticketmaster??

I would welcome any advice. My brother happened to purchase tickets a week ago Spider-man for Tues, Mar. 15th, which as of two days ago we just found out has now become OPENING NIGHT (needless to say, we were thrilled). Now he just received an email from Ticketmaster stating: "Attention ticket holder! We just learned that your upcoming event has been canceled:
Spider-Man Turn Off The Dark
Foxwoods Theatre
Tuesday, March 15th at 8PM"

with options for swapping or a refund. This is outrageous! Does anyone with experience with their policies know if they can get away with this? (I presume they're trying to free up blocks of seats now that this night has become important for "important people", etc.!!)

Thanks for any help -
- robjohn

But the performance ISN'T cancelled - just my tickets ..

No. The 8:00 PM performance is cancelled. The new, opening night performance is at 6:30 PM.

One word: "bummer" ...
- robjohn

True ...Actually, we have an ultimately happy outcome (under the circumstances) - my family just spent a couple of hours on the phone with Amex and Ticketmaster and managed to get the 3 remaining orch. seats for the day-after's 2 pm matinee (!)...thanks to everyone for their input!
Robjohn

Exactly...I would NEVER go to the matinee the day after opening night.....everyone will have been drinking late into the night.

In the instance that a patron visited the Foxwoods Theatre and paid cash for their ticket, how would they be notified that the performance they were to attend has been canceled? I seem to recall that when THE SEAGULL changed it's opening night date, the show did not change it's 8 PM curtain time nor refund tickets previously purchased for this reason. Sitting through a three hour play plus an opening night party late into the early morning hours after a full day of work, a joy!