More than 100 caped crusaders converged on the showground on Saturday for the Guinness world record attempt - to have 1500 superheroes in the same place at one time - and to raise awareness for children's charity Capes 4 Kids.

The charity aims to empower sick and hospitalised children by providing them with a handmade superhero cape. More than 3600 of the capes have been delivered to kids across the nation since the charity began in 2013.

Iron Man, Spiderman and Batman were among the most popular superhero costumes at the showground, with other popular outfits including Wonder Woman, Flash and even the Hulk.

Despite being just a few hundred superheroes short of the record, Queanbeyan resident and Capes 4 Kids founder Heather Foggett said she was pleased with the show of support.

"We've got superheroes all around us. We've got kids in every costume imaginable, having fun," Ms Foggett said.

"Queanbeyan has put on a great day for us and we're really appreciative of the community and wider community for supporting us."

Leilah and Greg Ayton attended with their four children, to support families in need.

Mum and Amelia, 7, both donned a Wonder Woman outfits, while dad and Nick, 6, arrived as Superman, Olivia, 2, turned brooding crime fighter as Batman and Penny, five months, sparkled as Superbaby.

"We just wanted to be able to help other people who aren't as lucky as what we are, to have four healthy kids," Leilah said.

"It's good to see so many parents dressed up with their kids.

"We were a bit nervous thinking are we going to be the only adults so it was nice to see so many people here and people from all walks of life having a good day."

The event was also a fundraiser for Capes 4 Kids to raise money for postage of the capes, the biggest expense for the charity.