AMHERST — Eight college-age people are facing criminal charges for violating the town’s noise bylaw after police responded to two large and loud parties over the weekend, the last before University of Massachusetts commencement on May 18.

At a Pelham Road home, police were initially called to respond at 11:39 p.m. Friday with concerns that people were getting into and out of vehicles parked along the street and crossing the road in an unsafe manner.

At 12:11 a.m. Saturday, police returned to the location for an altercation in which a man was punched in the face several times but declined medical attention. At least 500 guests were observed inside the garage, on the roof of home, on the deck and in both the front yard and back yard, with loud music playing and people consuming alcohol.

That response led to a 21-year-old Shirley man being arrested on charges of disorderly conduct and resisting arrest, according to emergency dispatch logs provided by the department, and a 21-year-old Hudson man being arrested on a charge of violating the town’s open container bylaw. In addition, three 21-year-old individuals who live at the home are being summoned to court for violating the town’s noise bylaw, which also carries with it a $300 penalty.

At least one person was found passed out at the resident from consuming too much alcohol and was treated by paramedics. There was also a fight taking place outside the home and several people taunting police officers before the party was cleared, with people leaving in their own vehicles, Uber rides and by walking along the road and through the woods.

The second major party took place at 11:53 p.m. Saturday on Tracy Circle, where in excess of 100 people had to be cleared out. Five residents, ages 21 and 22, were arrested on charges of violating the town’s noise bylaw, police said.

Another serious alcohol-fueled incident police are investigating took place at 10:55 p.m. Friday, when officers responded to a Nutting Avenue home after a man claimed that two of his friends were punched in the head and knocked out while trying to get into a party. Police are investigating the incident and trying to identity the possible assailants.

Scott Merzbach can be reached at smerzbach@gazettenet.com.