Work with your nonprofit to support a program, then tell them if they want to provide your local leadership with a table at an annual event or recognize your bank in some way that would be fine, but you financial support is for the program only.
Don't get two invoices, one for the programmatic support and one for the event sponsorship. And ask that the invioce only reference the progromamatic support, not the event.
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Societies that do not find work in and of itself "pleasing to God and requisite to Man," tend to be highly corrupt.