Quick answer: Before you open, get five things clear: what is opening, why someone should come now, where the door is, when the deal ends, and if your team can handle the crowd.
Pick your one big reason
Pick one reason to visit: a deal, a demo, an event, or a special menu. Do not put every reason on one sign.
Walk the path yourself
Walk or drive up like a new customer. Notice when you first see the building, which turn matters, and where people walk versus drive.
Get every part ready
Your website, map listing, phone answers, staff, deal rules, parking info, and in-store signs should all say the same thing.
Pick what you will track
Track normal calls, visits, or bookings before the event if you can. Decide who tracks it and how you'll handle mix-ups.