Will you share more details? Are you exhibiting at a trade show?

Freebies.

If all else fails, find the nearest restaurant or food vendor and purchase some coupons to give away to attendees.

Wouldn't you stop for a $5 off coupon on lunch?

Doing a lot of pre-show work is more important than what you do at the show. Post-show work should also NOT be an after thought.

Have a give away at your both that they sign up for in exchange for their email address. When talking to people, talk about the problem you solve or their problems that you would solve. Having a signup sheet and gathering emails can be more lucrative then anything else.

Frankly speaking there are a lot of ways to attract the qualifying prospect, but I personally feel that the most important one is to cultivate a magnetic stage personality that entices audience members to come speak with you after you exit the spotlight. Deliver a speech aligned with the goals of your business.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath