Add "Reminder" alert functionality to Calendar token

[derelict_wombat]

Currently the calendar file token for events doesn't seem to allow meeting reminders.   Meeting reminders on the calendar is important functionality that is currently missing and I think need to be added.  Adding this would help improve event attendance. 

Can you add the ability to schedule the calendar reminder to pop up 15 minutes before the meeting occurrence?   

[bshin]

@derelict_wombat Thank you for your idea. The Product Management team will evaluate your idea and may follow up with you for more details, if needed.