You can send reminders to helpers - if you check off all helpers, and an email will be sent to only to those who are scheduled for the date range chosen. It will send them a list of their upcoming shifts along with your optional message. On the List Helpers page, check off the helpers to be included in the reminder (usually all), then choose the date range for the shifts to include. Reminders will be sent out only to the checked off helpers who have shifts during that date range.
You will see a confirmation of all the emails sent out (Any helper who does not have a shift during that date range is not sent a reminder).