You can't set up a recurring email - only a recurring event. For both a recurring event and a regular event you can set up an email reminder. The way the email reminder works is different for a recurring event vs a regular event.
For a recurring event, everyone assigned to the event will get the email the number of days before the event you specify - but only for the first time they are scheduled to work the event. So if you have a recurring event and specify an email reminder 1 day before the event - and I am working the event the first 2 Mondays - I will only get an email one day before the first event.
For a regular event - you will get an email 1 day before (assuming you put 1 in the # of days before the event the reminder should be sent) every instance you are scheduled to work. So if you set up your bookfair as a regular event and you are working the first and third days - you will get an email the day before both those events.
Only people assigned to work the events will get those emails. You assign people to work events under Events - Assign.
I want to set up a recurring email for pizza night, but I want to test it first with a few users. How do I set it up and only select a few, it looks like I set up the event and it will just take my entire database. If the event is on Thursday and I want the email generated on Wednesday do I put 1 day for lead time and what time will this be sent?