The Building Official may grant special permission for the maintenance of a temporary sign or signs to a municipal, charitable, or nonprofit organization or requested special event for a period of not to exceed 15 days. Said permit, by the consent of the Building Official, may be extended for an additional period not to exceed 15 days. Submission of a refundable bond in the amount prescribed by the Town Board from time to time is required. The bond amount is refundable to the applicant upon removal and inspection by the Building Official or his designee.