In 1979, the Canadian Lesbian and Gay Rights Coalition declared an Annual Gay Holiday to be held every year on February 14th. Although that day was usually commemorated as Valentine's Day, the delegates wanted to take this opportunity to challenge what Christopher Isherwood has called the "heterosexual dictatorship" by affirming for ourselves and for the world, the existence, the strength, and the beauty of gay love.
There's a more substantial history of the declaration here.
Resolution proposed by the Gay Alliance for Equality (later known as the Gay and Lesbian Association of Nova Scotia) and adopted July 1, 1979 by the final plenary of the 7th annual Conference for Lesbians and Gay Men, Canadian Lesbian & Gay Rights Coalition, Ottawa
Tens of thousands of lesbian and gay people were 'exterminated' by the Third Reich. A pink triangle (on "homosexual" men) and a black triangle (on "anti-social" women - which included lesbians) were used by the Nazis to identify, and persecute, people because of their sexual orientation; just as a yellow star (two triangles - one inverted) was used to identify Jews. Today the black and pink triangles have been reclaimed by lesbian, gay, and bisexual people as symbols of pride and the struggle to overcome oppression, discrimination and prejudice.
RobinMetcalfe has presented a richly illustrated lecture about the pink triangle symbol and a century of history that led up to the creation of Pink Triangle Day.
The talk begins with an overview of gay culture in Germany in the early 1900s and the use of the symbol by the Nazis during the Holocaust, and extensively covers the history of gay rights in Canada and the movement in Halifax. Specific major topics: the Canadian lgbt community magazine The Body Politic and its provocative article, Men Loving Boys Loving Men, Gay Alliance for Equality, the protests against the CBC over their refusal to carry GayLine public sevice announcements, with images from the various incarnations of the NSCADQueerCollective and Dalhousie Gazette. The slides include many images by BobErtel.
The talk concludes with the history of the poster depicted above, designed by ChrisAucoin and sponsored by several groups including GALA, PlannedParenthood, HumansAgainstHomophobia, NSPIRG and DalWomensCentre.
Here's a 2015 CTV Morning Live interview with RobinMetcalfe the day before Pink Triangle Day 2015