? You can invite people manually using the Invite more button under the Viewers section, which can be found at the bottom right of the page.
If there is no need for a live event, you can use on-demand presentations for various big webinar concerns. One of the advantages is that it provides ease of content creation for subject matter experts, becaues they can record their portion online video at their convenience.
There are many strategies you can follow to generate leads with a webinar:
Tips to make your webinar more successful