Every year since 1999, 23 September has been Bi-Visibility Day.
Here are some of the articles I found and first posted on Bi-Visibility Day a few years ago:
Ignoring the B in LGBTQI denies us our identity by Vonny Moyes in The National
Why I don't like being asked which gender I prefer by Zachary Zane on Bustle
an article on how to be a bi-ally (with a nice bisexual umbrella).
an article from the National Union of Students about the importance of Bisexuality Visibility Day.
an older article about the need for Bisexuality Visibility Day.
Bi Community News is Britain's Bimonthly Bisexual magazine.
And I've been thinking about bisexual films of which there don't seem to be many, this is just off the top of my head but there's
Don't Look at Me That Way (which I reviewed for last year's Bi-Visibility Day here)
Treacle (which I reviewed here).