58 Pa. Code § 183.222
In the event of cancellation of any program after the completion of 50% or more of the races scheduled to be run on each program, no rain checks or other similar forms of deferred admissions shall be issued or if issued on admittance, no rain checks will be validated. In the event of cancellation of any program before the completion of 50% or more of the races scheduled to be run on such program, rain checks or other similar forms of deferred free admission shall be issued but no rain check or other form of deferred free admission shall be valid beyond the close of the meeting at which it is issued.
58 Pa. Code § 183.222
This section cited in 58 Pa. Code § 183.181 (relating to number of starters to be specified in overnight events; when race must be contested; declaration moneys).