One option that you might want to think of that will help you with PR is teaming up with sponsors. For example if there is a major event coming up and a lot of people are going to be attending it you might get more marketing if you have some sponsors that are willing to go in and buy some neat prizes so that you can stand out from the rest. You will also want to make sure that if you are doing drawings like this that you have a big banner or something where you and your sponsor's names are visible this way people can associate your name with the things that they are registering to win. You may also want to give away a little goody bag of some sort with a pen and note pad or something that ah's your name and your business logo so people will glance at your name every time they use the pen or note pad.