There is a delicate balance between advertising too early and waiting too long. The best time to begin your webinar marketing campaign is about two weeks prior to the event. You can continue your marketing efforts up to 24 hours before the event begins. However, you can still send reminders to attendees who signed up as little as a couple hours before to ensure they don’t forget to attend. You may also want to automate these notices so you can reach your audience, even if they are on the other side of the globe.