My theater company had to cancel a performance tonight. Of course with cancelling a performance comes notifying ticket holders. BuyPlayTix has a great feature for handling this, which took my stress level from a 9 to an 8.95.
Better than nothing, I guess.
To create a notification list based upon people reserved for a given night go to Contacts->Manage Lists. Enter a name for your mailing list. Then look under criterion on the right. You should see a “Show” capsule. Chose the correct production and show.

Then drag the capsule from the Criterion box to the Query box. If you do it correctly you’ll see all the contacts for that night populated at the bottom of the page. Click ‘Save’ and you’re ready to go.
Go to Contacts->Compose Message. Chose the list you just made from the List box, then type your message of regret and hit send.
At least one piece of cancelling a performance can be easy.