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Fiscal sponsorship generally only works when the sponsored activity furthers the 501(c)(3)’s own charitable/exempt purpose, so sponsoring a 501(c)(7) social club is unusual and would need very careful structuring (and IRS scrutiny) since social/recreational activities typically don’t qualify as charitable use of the 501(c)(3)’s resources. You’d want a nonprofit attorney to review this before proceeding, as the risk is jeopardizing the sponsor’s own tax-exempt status.