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Ultrapark Weekend takes place in late May in Pabianice, Poland, featuring three race formats: 100 km, 24 hours, and 48 hours. Klub Sportowy "O Co Biega" is the organizer, with Piotr Kardas serving as race director. The event is linked to Polish championship races for the 100 km, 24-hour, and 48-hour distances.
The races occur in a park environment near nature and water. The course is designed for sustained, measured efforts suitable for high-level performances. The 48-hour race has previously held IAU World Championship status, attracting elite multi-day runners. One edition saw 144 participants from 24 countries compete in Pabianice.