Kailesh's 5-year-old son Bareth Kailesh, his wife Bhamini Theiventhiran, 39, and his 66-year-old mother-in-law Umadhevi Theiventhiran also died.
Roycroft was approached to help organise the event by his boss Steven Male of Auckland Hot Dogs after the success of their fundraiser for the family early this month which raised about $1300.
Roycroft, who is also a New Zealand Management Academy student studying hospitality, said it was not too late for other businesses to donate time, money or product to the cause.
So far businesses including Coca-Cola, Repco, Goodman Fielder, Doolan Brothers, Abes Bagels, Mad Butcher and Nandos have all got behind the event which will be held at the Flatbush Community Hall between 10am and 3pm on Monday.
"We've got a lot of local, community support from big companies ... most are around our community so they were more than happy to chip in and help the best way they could."
As well as a multitude of food vendors there will also be activities for children including pony rides and a gold coin donation bouncy castle.
While some companies were donating their time others were prepared to donate their day's takings.
"They've [companies] asked how it works and we've told them whatever you raise you do whatever you want with it because it's your product you're selling.
"We've had a few places who have said they want to donate their day'1s profits to us, so that's pretty good, too."
Businesses wanting to take part can simply turn up on the day and set up a stall or donate product.
A Givealittle page set up for the family by the Refugee Council has so far amassed $88,000.
