The provisions of this article shall not apply to a not-for-profit security guard company, public entity, or tenant or third-party security provider of such tenant of a publicly owned sports venue with a capacity of at least sixty thousand people located in the county of Erie, which hires a security guard or guards for a specific event or events solely for its own proprietary use and which employs such security guards only on a temporary basis for a total period not exceeding fifteen days per year. Notwithstanding anything to the contrary, such tenant or third-party security provider of a publicly owned sports venue with a capacity of at least sixty thousand people located in the county of Erie shall ensure that no less than fifty percent of the security guards that such tenant or third-party security provider hires have obtained a license under this article.