No matter what your age, you would probably have a very hard time trying to top Mackenzie Moretter's birthday party, which was held at Veterans Memorial Park in Shakopee on Saturday.

That's just the thing – the party had to be moved there after some 300 people responded to a Facebook invite, which Mackenzie's mom posted after invitations to the girl's 10th birthday party went unanswered.

The actual number of people that arrived? More like 400.

The groundswell of support was unexpected, and probably so, too, were the celebrity guests who showed up to join in Mackenzie's celebration.

Former U of M and Minnesota Viking player and current Buffalo Bills tight end MarQueis Gray was in attendance, along with another NFL'er – Vikings Wide Receiver Charles Johnson:

Another big celebrity, Elsa from Disney's "Frozen," also took part in the celebration, according to Kare 11. The Shakopee Fire Department was on hand, too, letting kids have an up-close-and-personal look at their fire truck.

The station notes that Mackenzie, overwhelmed with happiness at the turnout, showed her gratitude to the large crowd with a heartfelt "thank you":

"I have a hard time making friends in school, but thanks to all of you … my voice was heard," she said. "I love you all."

Mackenzie suffers from a rare genetic disorder known as Sotos Syndome, which her mother says affects her speech and learning and makes socializing difficult for the girl.

It's a birthday she won't forget – and how could she? Shakopee Mayor Brad Tabke declared it "Mackenzie Moretter Day":