[gundos]

Just go prepared to hit a lot of balls. I am assuming that it will be indoors? If so, just wear whatever would be comfortable to golf in. It is a demo day, not a fashion show. I would wear sweats with shorts under so you can peel layers if you get too hot. Unless you have quiet feet, I would bring your golf shoes as well. Indoors off a mat, your feet can still slip. Take your glove(s) too. Hitting a bunch of balls indoors, you will probably work up a sweat.

I have no idea of the facility you are going to, but if possible, hit balls before you start. It will do you no good to go in cold and have to work up to a regular swing. They would probably let you hit a few before starting, but if it takes a while for you to warm up, go somewhere and hit a bucket before you start. We have a big demo day in my area once a year at a public course. I will go to another course and hit a bucket before going so I am not stiff trying to hit new clubs.