Congrats! I've found social media to be helpful and mostly free. Maybe you could look for some community pages for the area and post your event with a nice picture. Other than that, look for your target market. Who likes to buy from you? Would they read a certain magazine or go to an arts organization that will let you put up a flyer? Also, if the place that's holding the trunk show has a facebook or other social media page you'll get some advertizing there and can also interact with potential customers! Good luck!
