? We are also having a polish day so any tips on tradtional food,
you caould put up a poster in the school and ask the parents to contribute ideas, songs ect. It would ease your work load too.
Polish mothers would be by far the best people to help you out in deciding on something to eat. You could even invite some of them in on the day to help organize the food. You will have to make the work load easy on yourself. See if there is a Polish shop in your area, they too could help with ideas of polish dishes ect.