Captain Sir Tom Moore’s family is urging the public to take on their own charity challenges to mark the fundraiser’s birthday.
The war veteran would have been 101 on April 30 and his daughters Hannah Ingram-Moore and Lucy Teixeira have launched the Captain Tom 100 initiative.
They hope those inspired by his legacy could create their own challenge themed around the number 100.
The pair want any funds raised to add to the more than £32million their father made for NHS charities with his legendary garden walks.
Their initiative takes place from Friday April 30 to the Bank Holiday Monday on May 3.
Hannah said: “I really regret that he’s not here to share it as I think he would just love it.
“He was a Yorkshireman, remember, at the end of the day, not trending towards excitement most of the time.
“But he would have felt so proud ... he would have just felt proud to the core.”
Capt Tom raised the cash by walking 100 laps of his garden at Marston Moretaine, Beds, before his 100th birthday in the pandemic.
Money from sponsored activity over his birthday weekend can either be given to the Captain Tom Foundation or another charity.
The NHS hero died at Bedford Hospital on February 2 of pneumonia after testing positive for Covid-19.
But Hannah revealed her dad believed he would be going home and was looking forward to his 101st birthday celebrations.
She said he would tell the nurses: “I’m coming back out, I’ve got a lot of fundraising to do, I’ve got my birthday celebration.”
Hannah added: “None of us could have planned for what happened. “My father definitely did not expect not to be here. That’s just a fact. But he was 100 and a very happy 100.
“He lived those 100 years, and the last year was extraordinary.
“How we feel is that we were not expecting him not to be with us and we miss him desperately.”
Hannah also told how Capt Tom moved in with her family to their house at the same time as her family.
She added: “When we moved in here my father sold his house, we sold our house, he was originally going to buy another but we said, ‘Don’t waste your money, live with us.’ We’ve never lived here without him.
“He’s in the very fabric of the building, he’s all around us here.”