This is a custom em requested by colleen. It is supposed to work by setting a 'start-date' and then calculating up to 27 different timestamps based on various criteria over 3 days.
It then schedules survey invitations for each event that corresponds to a date/time.
If randomization = 1, then the day 3 events are not scheduled.
If you re-check the box, it will remove any queued invitations and replace them.
It requires that you have Twilio / SMS configured on this project and SMS is the default delivery mechanism.