There are 3 kinds of Reminders sent out for Volunteer and Calendar Events.

• You can set a Reminder to be sent via email a specific number of days before an Event. This will go to all Members or to only those people with the Tag for this event, if set to Private Event. Set this when creating the Event by going to either Calendar > Add Event, or Volunteer > Add Event. Scroll about halfway down and add a number of days to Set Reminder x days before event.
• Volunteers always receive a Reminder via email one day prior to the Event for which they are scheduled.
• An Open Spot Reminder goes out to all Members 2 days prior to an Event, to let everyone know that some Volunteer Opportunities are unfilled. You can turn this function ON or OFF in Settings > Admin Settings and scroll down to the Set Open Spot Reminder toggle. If toggled ON, you can choose the specific number of empty spots that will trigger the Reminder to be sent.