Officially recognised on March 21 every year, community members with Down syndrome and their families gathered at the Matuku Takotako Sumner Community Centre in Sumner on Sunday.
It falls on the same day every year, referring to the three copies of "chromosome 21" in the DNA of people with Down syndrome.
Father and Canterbury Down Syndrome Association Committee Member Steve McNab said the event was about bringing people together, to catch up and have a bit of fun.
"It's a great opportunity to celebrate our kids, and what we all have in common."
McNab said his daughter has Down Syndrome, and the experience had taught him that what she needed help with, other kids do too.
"Our kids are just like everybody else's"
Fellow father and Committee Member Ceon Lammers said he wanted to dispel the myths about people with Down Syndrome.
"The biggest myth is that all people with Down Syndrome are the same - it's almost like saying that all deaf people are the same, it's insane."
He said that his first aim was to educate teachers, as they're often too focused on keeping children safe instead of furthering them academically.
Lammers said when his daughter first went to school, the teacher told him that they had made a special corner for her to relax and read books, rather than participate with the rest of the class.
"I went to the Principal and told him, 'we need a different teacher this year.'"
He said that the CDSA helps parents to have those difficult conversations with authority figures.
Lammers said not everyone interacts with people with Down Syndrome, but said that was why this event was so important.
"We have adults who live fully, go to work, pay tax, and children fully integrated into their school community."
The National Down Syndrome Association released a video on the 21st March, as part of the international #WhatIBringToMyCommunity movement, celebrating World Down Syndrome Day.