A prize drawing is always enticing, especially for those hoping to win something big for the family. Put the prize entry location at the back of the store so they have to go all the way through to get there. Line the ends of aisles with the less expensive products so that the people who might just be there for the prize see items that might be in their price range. Have the drawing and if you want a large crowd a certain day, so you must be present to win. Gather e-mails for marketing as well.