You could treat a monetary contribution to a charitable organization as a deductible contribution for federal tax purposes only to the extent you didn't receive a benefit in return. So if you mean you contibuted money to a qualifying charitable organization and you didn't receive any tangible benefit from it, then you can treat it as a charitable contribution.
We know nothing about the organization for which you organized a cookoff, nor do we know about whatever yu did for a cheerleader. Only donations to qualified charities can be entered as deductions.
The gym is not a profitable organization and my niece is the cheerleader.