More than three hundred strangers from around Minnesota attended a girl's birthday party after all invited guests declined her invitation.
Mackenzie Moretter, 10, who has a rare genetic disorder, said it's hard for her to make friends.
Speaking to Kare 11 Mackenzie said: "I was sad that no one was coming."
Mackenzie's mum Jenny Moretter told ABC News: "I originally invited 10 girls three weeks prior, but we got two cancellations and the other girls' moms didn't RSVP at all."
"It's happened to her on previous birthdays where she would end up sitting alone with family. I didn't want it to happen to my daughter again this year," she said.
Posting a message on Facebook Jenny hoped that someone in her circle of friends could bring some girls the same age as her daughter over.
When Mackenzie was one, a tumour fused to her spine, leading doctors to discover and diagnose her with Sotos Syndrome.
Her dad Matt Moretter told Kare 11: "It causes gigantism where kids grow at a faster pace. So Mackenzie is a lot taller than other classmates," he said. "Kids are friendly to her, but she doesn't have friends. No one calls and talks to her. I'll show up at her school and she will be playing alone."
Hoping for ten people, hundreds gathered to celebrate her birthday.
Vikings player Charles Johnson and his family attended, Elsa from Frozen made an appearance and the Mayor of Shakopee, Brad Tabke, declared Saturday "Mackenzie Moretter Day".
Food was donated to feed 250 people as well as chairs and tables, while people brought gifts for Mackenzie.
Thanking everyone for coming, Mackenzie told the crowd, "I have a hard time making friends in school, but thanks to all of you … my voice was heard."
She added: "I love you all."
Her dad said it was an "amazing" day but realised they aren't alone.
"There were so many people who had similar stories to ours that we got to meet," he told Buzzfeed.
Similarly, Mackenzie and her family weren't the only ones touched by the kindness of strangers.
A spokesperson for the mayor told the family: "Thank you for reminding us how we should treat each other every day."