Down Syndrome Ireland is celebrating its 50th year in operation this year, as the world marks the international awareness day for the genetic disorder.
It's asking people to mark the occasion by putting on their brightest and most colourful socks and posting a photo on social media.
For the second year in a row, the traditional 5km walk and run in the Phoenix Park has been cancelled due to the pandemic.
The human genome is usually made up of 23 pairs of chromosomes, but the 21st pair is tripled in those with Down Syndrome.
That's why today, the 21st day of the third month, is recognised as World Down Syndrome Day.
