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.
Try to make a convincing invitation to drive registration. Don't give them a reason to feel like your invitation is a corporate "fill in the blank" form. Target a specific segment and make a personal connection, so you can retain them longer.
These paid Q&A webinar sessions can be held weekly or monthly with experts. Leave time for attendees to ask questions to build a quality relationship and fulfill the purpose of your session.
? Choose a relevant topic: