Add note flags to bookings & events

It would be great to flag an event or a booking with a note. There are many times when I need to make a certain announcement at an event or I need to relay a message to a player. Rather than post-its on my desk, it would be great to be able to flag a booking or event with a reminder. On the scheduler it would be good to have a flag icon that indicates to desk staff that there is a note to review on upcoming bookings.