Hoeveel weken tot 2021 Boston Marathon?

The Boston Marathon is an annual marathon hosted by several cities in greater Boston in eastern Massachusetts, United States. It is always held on Patriots' Day, the third Monday of April. Begun in 1897, inspired by the success of the first marathon competition in the 1896 Summer Olympics, the Boston Marathon is the world's oldest annual marathon and ranks as one of the world's best-known road racing events. It is one of six World Marathon Majors, and is one of five major events held in the United States through the years of both World Wars. See BAA for more details.