Industry charity Hospitality Action will be holding its second Lunch Box Day next month.
The charity is urging hospitality employers to support the fundraising initiative by encouraging staff to bring a packed lunch to work on Friday 23 September.
Companies that provide lunch for employees will be asked to donate the money saved for that day, while other businesses can make a donation on behalf of their team.
If lunch is not usually provided for workers, the charity has suggested employers treat their staff to lunch and ask them to donate the money they would have normally spent.
The Hoxton and the Arch hotel are among the first to sign up to take part alongside Ace hotel and St Ermin's hotel.
Penny Moore, chief executive, Hospitality Action, said: "In the first six months of this year, Hospitality Action spent £291,627 supporting industry colleagues in need through various grants and initiatives.
"We couldn't have done this great work without our supporters getting involved in fundraising events such as Lunch Box Day. It's very simple to take part and we hope everyone will share the idea with other colleagues and businesses too."
The charity is encouraging participants to tweet their lunches by using #SandwichSelfie and @HospAction.
For further information or to register your interest email: firstname.lastname@example.org
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