I’m kind of unsure why they’re not just working with the nonprofit they want to give money to? If they just want to give money, they can direct people directly to the nonprofit’s website. If they want to hold an event that is paid for by the donations, they could maybe sign on as a consultant for the nonprofit to help them put on the event? Also, this sounds way too much like a pass through to me: how would you as a fiscal sponsor fulfill discretion and control when the only requirement is pass it on to another nonprofit who has not signed a contract with you, didn’t ask for this kind of relationship, and has no obligation to you?