Social Media Lure
You could use your social media channels (Facebook or Instagram) to announce a particular day you are planning to put down a lure and what deal/deals you will be having for everyone who comes into the store. Some pizza places have given free slices to Pokemon players of a certain level–others are doing half-off prices on coffee or water.
But, by getting the message out on your social media, you’re getting the message out there that not only do you have a deal today–but that you’re open and welcoming this new cultural phenomenon.
Also, random aside, if you do this, just be prepared for a flock of people–it might even be best to have the whole staff working that day!