Is it Islamically permissible to distribute the profits from donations collected for a charity in such a way that 50% goes to session management, 30% to the team responsible for collecting the donations, and 20% to the charity itself, or are these donations designated solely for the charitable purposes of the organization?

Those in charge of charitable organizations are agents and trustees over the donors' money, and they are not permitted to dispose of it except as explicitly or customarily required by the agency. If the donor specifies the expenditure of the money, it must be spent accordingly and not otherwise. It is not permissible to take any part of it as compensation for work unless this is customary practice among organizations and the donor has not explicitly prohibited it. Funds from the sale of lecture seats are subject to the same ruling, and those in charge are not permitted to dispose of them except in a lawful manner; otherwise, it would constitute treachery and unlawful appropriation of funds.