Every year, some streets are closed, every hotel is booked, and the city of Boston and its' surrounding towns welcome runners from the next town over, and around the world, to participate.
As one of New England's most celebrated sporting events, the Boston Marathon draws participants from all over the world, including athletes from Northern Worcester County.
But Boston's race organizers still rejected her registration - telling her that women were not physiologically capable of running marathon distances.
"We had a good race, I was working hard to beat Ernst", Hug said.
Another notable race was in 2014. Yet, when she tried to run the marathon, a race official tried to rip her official number off her shirt.
"I wanted by 50 to be special and there's nothing more special than the Boston Marathon", she said.
"No dame ever ran the Boston Marathon", Arnie Briggs told Switzer when she was a 19-year-old journalism student that transferred to Syracuse from Lynchburg College in the mid-1960s.
This race survived that awful attack, and has lasted now into its 121st year, because of the loyalty not of elite runners but a large following of more human ones. "But I think we need all kinds of people".
The Boston Marathon traces its origin to an ancient Greek battle and has a rich history of its own, filled with war heroes and Medford milkmen who persevered through oppressive heat, blinding rain and the occasional fox terrier that strayed onto the course. She had to run it herself and started training with the men's cross country team, working her way up to 25 miles a day with Briggs. A few miles into the run, Semple chased down Switzer and attempted to take away her official race number. "And Jock thought we were trying to pull a fast one".
Two-time Olympic Desiree Linden probably is the top USA threat in the women's race.
Switzer's boyfriend shouldered him out of the way, and Switzer ran on.
Switzer, who won the 1974 New York City Marathon, successfully campaigned for the women's marathon to become an Olympic sport in 1984. "But nevertheless, she's a spirit child". The only other number retired was John Kelley's No. 61 after he ran 61 Boston Marathons, finishing his last in 1992 at the age of 84 with a time of 5:58:36. Jeptoo joins Rosie Ruiz, who was caught cutting the course in 1980, as the only people to be disqualified from the Boston Marathon after breaking the tape on Boylston Street. "I was serious about my running and I could not let fear stop me", she said. Switzer credits her for starting a movement, and Gibb acknowledges that it probably needed someone else to carry it forward. "It takes all kinds".
BOSTON (AP) Meb Keflezighi's last Boston Marathon.
After the race Monday, Switzer will make history again when her No. 261 becomes just the second bib retired by the BAA.