Timing can make a significant difference in the success of your email campaign. Start promoting your event at least 6-8 weeks in advance. Send a series of emails including a save-the-date, initial invitation, reminders, and last-minute notifications. According to studies, the best days to send event emails are Tuesdays and Thursdays, and the optimal time is between 10 AM and 2 PM. However, always test and analyze your own data for the best results.