I'll be wearing a great deal of purple, my bi pride Converse (complete with rainbow laces) and possibly my 'Some people are Bi, Get over it' top from Stonewall.
I have my bisexuality permit ready :)
I bathed in the bisexual magical potion last night.
And if anyone spouts rubbish, I have some Space Invaders on my side :)
On a serious note, if you are wondering why there is a Bi Visibility Day once a year then read this article where bi people talk about their stories and the some misconceptions that surround bisexuality.