World Voice Day is a worldwide annual event devoted to the celebration of the phenomenon of voice. The aim is to demonstrate the enormous importance of the voice in our daily life, as a tool of communication, and as an application of a large number of sciences, such as physics, psychology, phonetics, art, and biology. The celebration of the World Voice Day is scattered around the globe, including concerts, symposia, open house at voice clinics and voice education institutes, TV shows, radio programs, flash mobs etc.

Some interesting links:

Our friends at MajoringInMusic.org posted an article in observance of World Voice Day 2013.
"Sounds like an oxymoron, but World Voice Day gives us a chance to consider the benefits of silence. Your larynx is in constant motion.  Every time you breathe or swallow, your larynx moves, so unlike most other parts of the body, the larynx is never truly “at rest.”  Here are a few thoughts on maintaining vocal health through the acronym of SILENCE."
Full Article

Journal of Singing Editor Richard Sjoerdsma discusses World Voice Day 2013.
“As singers, our understanding of our own voice is of little value until we express our art. This opens up an area too vast to be detailed here, but about which a great deal has been written. Perhaps one can extend the familiar metaphor of the tree falling in the forest: Can a song be a song without having been sung? One’s connection to the act of singing is realized in the art of singing.”
Full Article

World Voice Day HomePage