Bi Visibility Day, which falls annually on 23 September, recognises and celebrates bisexual people and the bisexual community as a whole, as well as to combatting biphobia. Page is best-known for designing the bisexual Pride flag. (Ross Marin/Getty)The reason Bi Visibility Day occurs in September is because the activists wanted to pay homage to one of the famous bisexual people in history, Freddie Mercury, whose was born in this month in 1946. You may like to watchWhile it is not an official holiday, it is recognised by many as being an opportunity to uplift the bisexual community. In 2012, the city of Berkeley in California became the first to declare the day officially as Bisexual Pride and Bi Visibility Day.