https://en.wikipedia.org/wiki/International_Transgender_Day_of_Visibility
International Transgender Day of Visibility (often referred to as TDOV or Trans Day of Visibility) is an annual event occurring on March 31 dedicated to celebrating transgender people and raising awareness of discrimination faced by transgender people worldwide, as well as a celebration of their contributions to society.
an action or a service that helps to cause or increase sth 贡献；促成作用
~ (to sth)
He made a very positive contribution to the success of the project.
他对项目的成功作出了非常积极的贡献。
the car’s contribution to the greenhouse effect
汽车对加剧温室效应所起的作用
~ (toward(s) sth/doing sth)
These measures would make a valuable contribution towards reducing industrial accidents.
这些措施将会对减少工业事故起重要的作用。