A few blocks down is the finish line, which runners will be eager to see, but the important place for some runners from Europe is at the corner of Boylston and Tremont.
This is where people who have been delayed by the cloud of ash will be able to pick up their bibs from 6 to 7 in the morning before getting on the bus to head to the starting line in Hopkinton.
This is what pre-marathon Sunday looks like for most of the 26,776 runners and their families not stuck in Europe.
They lined up, then carbed up on macaroni and cheese, ziti, pasta salad, veggies, and bread at City Hall Plaza in Boston.
Roy Young of Gresham, Oregon needs more carbs than most.
He will run three marathons in 13 days.
James Walsh won't be running
78.6 miles over the next two weeks.
But it's his 16th Boston, and this year he turned 50.
His trip here from Dunmore, Pennsylvania was without the hassle of a volcanic ash cloud that has grounded an estimated 500 to 600 runners in Europe.
Race officials said they won't know how many don't make it until runners cross the starting line Monday morning.
Among the European marathoners served a pre-race meal by Boston Mayor Tom Menino, Hans Peter of Munich, Germany who made it here Thursday - but his friend is stranded overseas.
Those runners from Europe who do not make it can contact the Boston Athletic Association to get a place in next year's race without needing to re-qualify.
Source: NECN: Boston, Mass