Wicksteed Park was awash with pink for the 13th annual Crazy Hats walk to help the charity hit the £2million milestone.
More than 2,100 registered for the walk on Sunday, although organisers believe there were far more there on the day who may not have registered.
All money raised will go to help improve breast cancer care at Kettering and Northampton General Hospitals.
Glennis Hooper, founder of the Wellingborough-based charity, said: “Walk number 13, or 12 + 1 for those who are are superstitious, turned out to be very lucky for Crazy Hats with the beautiful sunshine being a welcome bonus and the icing on the cake.
“After so many years of wind, rain, snow and extreme cold conditions we deserved a good year.
“Right from when I left home at 5am, the whole day went like clockwork. It was so lovely to be able to set up and pack away in the dry.
“More importantly, for the walkers, the day could not have been better.
“Special thanks to Wicksteed Park for allowing us to use the park – we had many comments about how lovely it was to walk along the lakeside route this year.”
Although they didn’t reach their target for 3,000 walkers, Glennis said they were extremely happy with the number, and added: “The atmosphere and the smiles on people’s faces was magical.
“We are now just over £11,000 short of the staggering £2 million raised in just over 13 years. Whose sponsorship money will take us over that total?”