Celebrated on May 17 every year, International Day Against Homophobia, Transphobia and Biphobia began back in 2004.
FYI, it's known as IDAHOBIT for short in the UK. The day aims to raise awareness of the fact LGBTI people across the world still face discrimination and hate crimes. And it's become a massively important day, drawing the attention of world leaders and local authorities.
Why May 17? Well, it was chosen as a way to commemorate the day the World Health Organisation declassified homosexuality as a mental disorder, back in 1990.
What's really awesome is, according to the Day against Homophobia website, IDAHOBIT is now celebrated in more than 130 countries (and in some of those same-sex acts are still illegal). Here's some people and organisations in the UK who proudly marked the day.