We had an issue this week with a class booking (up to 11 people). The teacher phoned in sick, and we had to cancel both of her classes. It would have been great if we could have clicked the class in the calendar, selected all attendees, then selected SMS or email, and sent a message informing the attendees that the classes were cancelled. The only way to do it presently is to click each attendee's name and cut & paste the message from the contact screen to SMS or email.