To gain the trust of an audience, you can conduct polls, measure the market and make adjustments according to demand. These polls will help gain feedback from your registrants about your products and services, and get important information to make decisions.
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.
Email is by far the best option to send thank you notes and reminders to the person who signs up for the webinar. Set an email automation for those who sign up for the webinar, add your product benefits in the email and give them a little introduction about what you are going to serve them during the webinar. Also, email is the way to make your prospect feel important
The best way to evaluate your topic is to conduct a live Q&A session. The audience gives their opinion about the topic you have selected and asks various related questions that will help you to create the perfect strategy for your webinar.