If you’ve raised funds that are no longer needed and haven’t transferred them to your bank yet, you can refund your donors. This action is irreversible, so once you decide to issue refunds, you won't be able to undo it. Your donors will generally receive their refunds in 7-10 working days. (Weekends and bank holidays aren't included.)
Refunding a charity fundraiser
Charity donations are usually non-refundable. These donations are typically irrevocable and undesignated contributions, and there may be tax implications for the charity and donor if refunds are issued. Donations made to charity fundraisers are subject to the terms found here.