4 Pa. Stat. § 63
In any municipality the will of the electors with respect to the conducting, staging, and exhibiting of motion pictures and sound motion pictures on Sunday may, after the year one thousand nine hundred and thirty-five (1935), but not oftener than once in four years, be ascertained, and the question, as provided in section 3 of this act, shall be submitted to the electors of any municipality at any municipal election upon demand in writing of petitioners equal to at least twenty per centum (20%) of the highest vote cast for any candidates in the municipality at the last preceding general or municipal election. Such petition shall be filed with the corporate authorities at least sixty (60) days before the day of any municipal election at which the question is to be submitted, and, if the petition is signed by the requisite number of petitioners, it shall thereupon be certified to the county commissioners, who shall cause such question to be submitted in the same manner as is provided in this act for the election in the year one thousand nine hundred and thirty-five (1935).
If a majority of the voters, in any municipality in which motion picture exhibitions are permitted from and after two o'clock postmeridian on Sunday to which an admission charge is made or is incidental, are not in favor of the continuance of such exhibitions, then upon the certification of such election return to the acting chief executive officer of such municipality, as is provided in section four of this act, it shall thereafter be unlawful to conduct, stage, manage, operate or engage in such exhibitions after two o'clock postmeridian, on Sunday; but if a majority of the electors in any such municipality which has not heretofore permitted such motion picture exhibitions after two o'clock postmeridian, on Sunday, or which has not theretofore voted on such question are in favor of such exhibitions, then upon the certification of such fact to the acting chief executive officer of such municipality, as is provided in section 4 of this act, such exhibitions shall thereafter be lawful.
4 P.S. § 63