A 'phenomenal' response to a fundraising day in Ockwells Park, Cox Green, has given Matt's Fund a giant shove towards its £150,000 target.
Organiser Chris Rackley, who began the Matt's Fund campaign, said the team collected more than £27,000 on the day alone.
Matt's Fund was started with the goal of sending Chris' brother Matt Rackley to America for pioneering cancer treatment which could potentially save his life and passed the £100,000 mark last week.
Young dad Matt, an electrician from Cookham, was diagnosed with a brain tumour in 2012 and was told last week that a hospital in Oklahoma had confirmed him as a candidate for the high-tech 'proton therapy'.
The proceedure is not available in the UK and the family have been working with the Kids 'n' Cancer charity to help secure the treatment.
As the Matt's Fund team continued its final push to get him there, all roads leading to Ockwells Park became gridlocked as hundreds of supporters turned out to help the cause yesterday.
An 'It's a Knockout' style competition, a zorb football tournament, games, stalls, live music and plenty of grub were all on offer at the park off Ockwells Road.
"Today has been unbelievable," said Chris.
"There was a phenomenal response.
"Everyone seemed really happy and it was just a great atmosphere.
"The charity (Kids 'n' Cancer) is going to come down and talk us through everything, about going out there and all the small details.
"Now it's just a case of getting him out there and getting it done."
Matt paid tribute to the endless stream of volunteers who had made the whole day possible and his partner Hollie Gemmel thanked all the companies who had supplied activities and stalls free of charge.
Visit justgiving.com/mattsfunding to donate.
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The crash, which took place at about 7am today (Thursday), involved three vehicles. One man sadly died as a result of the collision and his next of kin have been informed.