As soon as a person register for your webinar, send them a thank you mail and a confirmation mail. Sending this is not only good manners, but will also help get a confirmation from the registrant side.
Send them invites for your webinars or whitepapers. Send an email regarding it, and wait for their response on it.
? If your business has a group on Facebook, make use of this group to post specifics of the event along with the link to the registration
? Offer something special:
How to make money with webinar advertising
? Choose a relevant topic: