Proceeds from a fundraiser such as an auction, a sale, a raffle, an activity or event are qualified as a collective donation. The proceeds of a fundraiser do not entitle you to a tax certificate because you do not make the donation on your own behalf only.
A donation is a sum of money one person, company or organisation makes to the Foundation against Cancer without consideration. The donor receives nothing in return. Only personal gifts entitle their donor to a tax certificate.