Hello Brigitte...hope you have some grape cookie designs! (I read your profile)
people will want to see everything your can do. So I would do it. This is before holiday...lucky you. I would do Halloween/fall thanksgiving and Christmas. Only samples of thanksgiving and Christmas. People will buy Halloween now for fun and then you can take orders. Have samples for people to taste. I usually make some large cookies and cut them up as needed. If you have time make some small pretty samples and mix it up. I put samples on a pretty small crystal cake stand. This is your first show so it's a learning experience.....have fun....be happy and smile..! Remember your working with a happy product !