The Isle of Man championship takes place on the public roads whereas roads are closed to the public transport by the parliament of Isle of Man that goes by the name Act of Tynwald. The event consists of one week of racing preceded by one week of practice. Following the tradition that probably started in the early 1920s, spectators tour the Snaefell Mountain Course riding motorcycles on an event on the Sunday between the Practice Week and the Race Week, the day or the event is called Mad Sunday.