I’m not sure where it has come from, but I love the way bits of the internet seem to be slyly rebranding 23/9 as Bi Visibility Day. "International Celebrate Bisexuality Day" is a hell of a mouthful as a name, and a little nebulous as a concept: what do you do for International Celebrate Bisexuality Day ? Are you being celebratory enough? International enough?
Whereas Bi Visibility Day, you could sensibly mark with a bi resources stall in a bar or student union foyer, with flyering local gay or straight venues, with a balloon launch outside your town hall, or whatever.
The only downside I can see is where ICBD sounded like a type of Russian nuclear weapon, BVD sounds more like something you need to go to the clinic to get treated. But the shorter name will in itself be less in need of having a shorthand form.
We’ve had ten years of 23/9 being ICBD. I love the subtle shift in the name, and I think ten years on is a great time to start using a new name for the date that can inspire new forms of visibility activism.