Is it permissible to take an additional amount when dividing the cost of reserving a football field among the players?

If the congregation entrusts you with renting out the stadium, then you are their agent. It is not permissible for you to charge any of them more than their due share of the total amount, whether they know about it or not, based on the Prophet’s (peace be upon him) saying: “The wealth of a Muslim person is not lawful except with their willing consent.” It is permissible to take the increase if they willingly agree to it, in return for your organization of the process.