Try an NFC “tap-to-unlock” perks wall: turn one booth wall into a grid of hidden tap spots that open unique mobile pages when visitors tap with their phone or badge (with QR as fallback). Each spot reveals a perk—instant discount, demo fast-pass, premium content, raffle entry, or a meeting slot, captured via a super-short badge scan/form and logged with UTMs per tile. Add a quick LED flash on the wall whenever a perk is claimed to create visible buzz. Rotate perks hourly to encourage repeat visits, and display a simple counter (“Perks unlocked today: 237”) to gamify the experience. It’s zero-friction, highly curiosity-driven, segments prospects by the perk they choose for smarter follow-up, and yields clean metrics like scans, claims, bookings, repeat taps, and revenue influenced—while staying compact and easy to run.