Running a node at a different times specified

Hi, 

I Have a Requirement that, post to event smart service should run at different times specified.

We have two role based users,
Creator :who can create an event
Attendee : whom are invited to the event.

Event start time will be saved into the startDateTime ruleinput.

creator can send remainders to the Attendees with the available options as before 5min, before 10 and before 30min.
Remainder time will be saved as an integer array.

 So we need to post the event to the attendees at a specified time,

I have used this function , which gives datetime after subtraction of minutes .
=subtractminutes(startDateTime,remainderTime)

My query is, how can I trigger a node multiple times, with a multiple datatimes.