At trade shows, if you're lucky, you'll hold the prospect's complete attention for two minutes. At a seminar, you have control for the duration of your seminar. That might be one hour, or as long as a week depending on your product and market. In either case, it should be enough time to demonstrate your product and your company's expertise at solving your customers' problems. T here are many companies with products that are well suited for team selling, where various members of your staff play different roles in the customer sales cycle.
Seminars are perfect for team selling.
D on't take my word about the intelligence of seminars. I'm biased because I've been orchestrating seminars for my employers and many clients for 15 years. Instead, just look at your situation as a prospect. In a given week you probably get several invitations to seminars. But you only go to those that cover a topic important to you.