The Shifter's 5k Race is coming up on Saturday, March 31, and your last chance to pre-register is on March 30.
The race, which is part of the larger Race Around Waltham series, is scheduled to start Saturday at 1 p.m. Patricipants can pre-register for $25, or do same-day registration for $30, according to the race website.
The first 250 participants will get free t-shirts, and free food and drinks will be available after the race. Prizes will also be given to the top four finishers in each age group.
The race proceeds will benefit the Dana Farber Marathon Challenge.