The $10 entry fee, which included a photo with Bonino and the cup, will benefit the Connecticut Children's Medical Center.
The Penguins celebrated their fifth Stanley Cup victory. Players on the winning team are allowed a day with the Stanley Cup, a National Hockey League custom. It was the second time Bonino brought the cup home.
A 2007 graduate of Avon Old Farms, he captained the school's team to a New England championship, followed by success, and a national title, at Boston University and then a stellar career with the Penguins.
He also played for the Vancouver Canucks and Anaheim Ducks.
Bonino, a Farmington native, recently signed a four-year contract with the Nashville Predators, the team the Penguins defeated in the Stanley Cup. In game two of the finals, he played through a broken tibia, which is nearly healed.
He tried to play through the injury before game four, but the injury proved too much for Bonino.
A long line of fans filled the school's gymnasium, eager to get a photo with Bonino and the cup. The cup was placed on a pedestal.
Jacqueline Sembor, the school's senior communications and project manager, said Bonino brought the trophy back to his "stomping grounds," where he was an honored varsity player.
"When he came back to bring the cup here and share it with the Avon community, we were thankful and honored he chose us," Sembor said. "It really shows his love for the school and how much the hockey program did for him."
She said Bonino told the students that hard work and determination are needed to be successful in not just sports, but in life.
"Stay committed, work hard, put in the effort, and things will happen if you have talent," Sembor said.
She added Bonino recommended playing different sports. He was also a standout lacrosse player at the school.
John Gardner, who coached Bonino in hockey at Avon Old Farms, said he was pleased his former player returned with the Stanley Cup for the second year in a row.
"He's also doing positive things by raising money for the children's hospital," Gardner said.
He expected the event would raise more money than the previous year, around $6,000.
Gardner said NHL players are known for working on behalf of children's charities.
"Using the Stanley Cup to raise money is fantastic," he said.
Gardner added a lot of skilled athletes never make it to the professional level because of poor work ethics. He said Bonino had the talent and the drive to be successful at all levels in hockey.
"Everywhere Nick (Bonino) has gone, he's been a winner," he said. "Now, he's playing at the highest level in hockey, winning Stanley Cups back-to-back,"
Lucas, 12, of Manchester, said, "It felt really good, because I want to be like that, I want to be that person. I want to be Nick Bonino. It's cool that I got to meet him."
Lucas, who plays hockey in Newington, watched Bonino and the Penguins in the playoffs.
"I was kind of nervous they wouldn't win," he said.
He added that Bonino told the children to give back to the community.
While fans stood for photos, Mario Della-Savia and Matt Parolin kept their eyes on the cup. Both men travel with the cup throughout New England, for the Hockey Hall of Fame in Toronto.
"It has super-duper elite status," Della-Savia said about the cup.
Five cup handlers deliver the trophy from player to player. The cup spent six days in New England during a recent trip. Ron Hainsey, a defenseman for the Penguins, was to get his time with the cup next, followed by Jacque Martin, an assistant coach with the team.
"It's a tough trophy to win and there's only one Stanley Cup," he said.