Journée du t-shirt orange

Etymology
. From the colour of the shirt worn by a survivor of the residential school system, that was forcibly removed by Christian missionaries attempting to assimilate her into the culture of 's settlers, and away from her culture. From those observing the day, who wear orange T-shirts.

Proper noun

 * 1)  September 30th; Orange Shirt Day; a Canadian national observance first observed in 2013

Coordinate terms

 * a coincident Canadian national holiday first observed in 2021