The income from such station or hall, or both, shall be taken to include all rentals for services performed by such broadcasting station or for broadcasting commercial or semicommercial radio programs, and, in the case of the convention hall, income from store and concession rentals, income from the rental of the hall, events of all kinds and descriptions, and admissions or all other moneys received from the use of any facility in such hall. If the income as herein defined shall be insufficient to meet the expenditures as hereinafter defined, the municipality shall in its annual budget make provision for such deficiencies.