The 48th Head of the Charles Regatta is expected to bring more than 300,000 spectators to the the banks of the Charles River to cheer on thousands of rowers. The 3-mile stretch begins at Boston University’s DeWolfe Boathouse in Cambridge and ends at Artesani Park in Boston. The regatta will host 55 competitive races over a two-day period with 9,000 athletes ranging in age from 14 to 85. It is the world’s largest rowing competition.

Here is a look at the event details and schedule.