With all due respect to Lawrat....
Who did you work for?? Was their a written agreement for the work or verbal?? Did you use work orders?? Who directed your work??
In any case, you absolutely have a right to be paid for your work.
I don't care if the work was for the Pope personally, you need to be paid for the labor that you did (assuming it was acceptable). Document your case and file in small claims court. After you win your judgment, you can consider donating it to the non-profit.
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Steve Halket
Judgment Recovery of Houston
[email protected]
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This is my PERSONAL OPINION and is not legal advice! Consult your local attorney for your specific situation and laws!