Police say a group of four men engaged the 22-year-old male in a verbal confrontation that then turned physical, resulting in a head injury for the victim.
The Nittany Lions will make their seventh appearance in the NCAA Tournament in the last decade.
Clifford is making his ninth start of the season in Penn State's game against Indiana.
Penn State men's soccer veterans Pete Mangione and Seth Kuhn rolled in All-Big Ten first team postseason honors.
The 28-year-old woman was unconscious at the scene and taken to University of Pittsburgh Medical Center in Altoona for treatment of her injuries. She later regained consciousness.
The event will begin at 6 p.m. on Thursday in the State College Municipal Building.