We have Mother’s Day, Father’s Day and why not, in Poland they have Children’s Day. To celebrate Children’s Day Drzewiecki Design is giving a 30% reduction on all their sceneries. Children’s Day (DzieÅ„ Dziecka, literally “child’s day”) is celebrated in Poland on June 1….”. So check out simMarket TODAY!“…. The International Children’s Day was introduced in Poland in 1952. It coincides with the beginning of summer and it is usually treated as a holiday, as it takes place near the end of the school year. Schools usually organize special activities for the day of the celebration, and the first week of June is a time of festivities organized in parks and entertainment centers for children. Parents usually buy small gifts for their children.