somewhat similar thing happened to me last year, but with ticketmaster.
I had a ticket booked well in advance, i just happened to be recheck all my bookings 2 weeks before my trip only to find the show on that night was cancelled (basically they changed the nights that they are dark) anyways, i didnt get an email or anything, if I didnt happen to go check my reservation I would have never known it was cancelled and would have showed up to collect my ticket only to see the theatre closed.
I had to email ticketmaster to find out what was going on, was refunded, and I went in and rebooked for another night, thankfully got back a similar seat.
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre