It’s called Anti-Bullying Day. It is also known as Pink Shirt Day.
”
Anti-Bullying Day (or
Pink Shirt Day) is an annual event, held in
Canada and other parts of the world, where people wear a pink-coloured shirt to stand against
bullying.
The initiative was started in Canada, where it is held on the last Wednesday of February each year.”
“In May 2009,
New Zealand celebrated its first Pink Shirt Day.
[1]
In 2012, the
United Nations declared May 4 as
U.N. Anti-Bullying Day.
[7] Similarly,
UNESCO declared the first Thursday of November as the
International Day against Violence and Bullying at School Including Cyberbullying.
[8]“
en.wikipedia.org