? Get sponsors:
webinar don't always attend the webinar. Adopt measures to convert these registrants to attendees.
? Develop great content:
Send them invites for your webinars or whitepapers. Send an email regarding it, and wait for their response on it.
present their products and services to targeted groups, so they can generate interest in their brand and their audience can get some benefits from it.
? Make an email list: