Cheryl, Kimberley Walsh, Nadine Coyle and Nicola Roberts will be fundraising throughout this year, including a 5km running event named the Race For Life For Sarah, which aims to celebrate Harding’s life as well as raising money.
The singer died aged 39 in September last year, after revealing that she had been diagnosed with breast cancer, which had spread to other parts of her body.
The 5km event will take place on July 24 at Race for Life in Hyde Park.
Race For Life For Sarah will begin at 11.30am as a special addition, and will be attended by Cheryl, Coyle and Roberts.
Walsh will be completing the 5km at home, and those who cannot attend are encouraged to do the same.
Posting on her Instagram story, Cheryl said: “So around this time last year when Sarah was really sick, we were all desperately trying to find ways to help her, to comfort her, to do whatever she wanted.
“You feel so helpless in times like that.
“And one of the only things she really wanted was a gala dinner, so while that is under way and we are doing that, we felt like we could be doing more and we have decided to do Race For Life For Sarah at Hyde Park on the 24 July.
“And I know so many of you wanted to support her, you were helping her all the way through the illness, and we would really love it if you could join us there.”
Writing on Instagram, Roberts said: “Let’s come together and make it a beautiful day for and contribute towards making a difference for other women too.”
The event is non-competitive, and participants can run, walk or jog the 5km route.
Race For Life For Sarah is part of Cancer Research UK’s Race for Life event series, in partnership with Tesco.
The fundraising efforts will conclude with a large gala dinner later in the year.