ThursdaySwimmingWPIAL Championships at Trees PoolHockeyPIHL Class AAA PlayoffsButler vs. Peters Township, 7 p.m., at SouthpointeSeneca Valley vs. Cathedral Prep, 8:30 p.m., Mercyhurst Ice ComplexPIHL Class AA PlayoffsMars vs. Plum, 8 p.m., Baierl Ice ComplexPIHL Class A PlayoffsFreeport vs. South Fayette, 9 p.m., Belmont Arena

FridayBoys BasketballPIAA Class AAA PlayoffsMars vs. Clearfield, 7 p.m., Clarion High SchoolPIAA Class A PlayoffsCardinal Wuerl North Catholic vs. Union, 6 p.m., GatewayGirls BasketballPIAA Class AA PlayoffsKarns City vs. Carlynton, 6 p.m., Clarion UniversityMoniteau vs. Our Lady Sacred Heart, 6 p.m., Cardinal Wuerl North CatholicWrestlingWPIAL Championships at Penn HillsSwimmingWPIAL Championships at Trees Pool