While it's true that most goths prefer night time World Goth Day lets them parade the black look proudly in the sunlight!
Goths are often met with criticism and fear. But despite their dress, they're just like everyone else and judging someone based on the way they look means missing out on getting to know some great people. Consequently because of the stigma attached to being a goth, many have struggled to get friends and family to accept them as they are.
World Goth Day is the day they come out in the light to proudly proclaim their way to the rest of the world, and to show us some of the fun things we're missing.
And there's lots more information over at http://www.worldgothday.com/.