The Polish equivalent of the prom ("studniówka") is a very popular event held each year throughout the country; the word itself means "of or relating to 100 days". Most schools organize such an event about 100 days before the (matura) exam session. The first dance of the prom is the traditional Polish polonaise. In the past, the dress code for the "studniówka" was the same as for final exams, i.e. a white blouse or shirt with a dark skirt or trousers. As opposed to the "studniówka", formal attire is required for the so-called Grand Ball ("bal maturalny"), held after graduation. Nowadays, as Grand Balls are rare, the "studniówka" has adopted a formal dress code.