A beer permit has no expiration date, and counties and cities are prohibited from requiring periodic permit renewals.  T.C.A. § 57-5-103(a)(9).  A beer permit expires upon termination of the business, change in ownership, relocation of the business, or change in the name of the business.  A permit holder is required to return the permit to the county or city that issued it within fifteen days of the occurrence of one of these events, but the permit expires regardless of whether the permit is returned.  T.C.A. § 57-5-103(a)(6).  Unless one of these events occurs, a beer permit is valid until suspended or revoked in accordance with T.C.A. § 57-5-108.