4 Pa. Stat. § 91
Whenever in any city of the first, second, second class A, or third class, or township of the first class, a baseball game is being conducted under the provisions of the act of April 25, 1933 (P.L. 74), entitled "An act relating to baseball and football on Sunday; prohibiting baseball and football on Sunday during certain hours, and also during certain other hours unless the electors of a municipality are in favor of the same and, in certain cases, a license has first been secured from the municipal authorities; providing for referendums to ascertain the will of the electors, and for the enactment and repeal of licensing ordinances and resolutions in accordance therewith; providing penalties; and repealing inconsistent laws", and the game has not been played to completion before the hour of five o'clock post meridian, such game may be completed notwithstanding the provisions of any law of the Commonwealth to the contrary.
4 P.S. § 91