International River Days, a five ay festival along the International Riverfront marked the 2007 opening of the River Walk along the east river leading up to the International Freedom Festival fireworks. Detroit, Michigan and Windsor, Ontario jointly celebrate the multi-day festival the last week of June which draws about 3.5 million visitors in order to commemorate each country's respective National holiday - (US Independence Day on July 4 and Canada Day on July 1). The International Freedom Festival began in 1959. It is organized by the Parade Company, a not-for-profit organization governed by the Michigan Thanksgiving Parade Foundation. It has a long list of sponsors.