You can set a reminder for the event in the form of an alert or an e-mail.
Clicking on will open a few fields to be filled in.
You can choose the type of reminder you would want for the event (alert or e-mail).
You can choose the time when you would want to get reminded about the event.
You can remind the invitees too by clicking on the remind invitees check box.
You can save the reminder by clicking on icon and click on to delete the reminder.