The 1st of May is Labor Day in Poland, commemorating the 1886 Chicago strike. People celebrate with picnics, trips, and barbecues of meat and vegetables with friends and family. The 2nd is Polish Flag Day, a work day when people hang flags and wear bows. The Polish flag is white and red. The 3rd of May marks the anniversary of the 1791 Polish-Lithuanian Constitution, celebrated by singing the anthem and painting in patriotic colors.