For Notifications which send on Event Start and Event End, it would be useful to have the ability to have multiple Message Formats for the same Notification (one to send out at start, one to send out at end).
Advantages:
-Can include "End Time" in only the Notification sent at end (rather than showing an erroneous 1/1/1970 00:00:00 included in the Notification sent at start)
-Can include "Duration" in only the Notification sent at end
-Can fully customize different messages for start and end of the Event Frame
