(a) If the voters of a municipality or county have approved a tax under this subchapter at a rate of less than $20 for each event, the municipality or county may call an election for the approval of the voters to increase the maximum tax rate. If a majority of the votes cast at the election approve the new rate, the municipality or county may increase the rate of the tax to the maximum rate approved.
(b) The ballot for an election to increase the rate of the tax shall be printed to permit voting for or against the proposition: "The increase of the facility use tax for the purpose of financing __________ (insert description of the designated facility) to a maximum rate of __________ per event (insert new maximum rate not to exceed $20)."