Document Freedom Day 2012
Document Freedom Day 2012 was held on March 28th 2012
"Document Freedom Day celebrates the importance of Open Standards for all electronic documents, whether public or private. If we want to preserve our digital heritage we all need to select Open Standards, implementable by anyone, as our default storage choice." -- Jeremy Allison, Samba core developer
Many events will be held on the day itself -- http://documentfreedom.org/2012/events/index.en.html has a list of them.
This page was a featured resource in March 2012.