It seems that June 14 was the 3rd Annual Internation Weblogger's Day (or InWeDay). I'll keep an eye out for it next year.
The idea of this site is to unite webloggers from across the world in a petition to the global community for a such a day as an "international weblogger's day". While yet an unofficial event, webloggers can commemorate the work of their peers by celebrating this day. Furthermore, InWeDay, as it is now called in some places, is a not-for-profit concept.