I have updated my open source conferences calendar with dates for many conferences in 2012 that were previously not yet announced. If you see anything missing or wrong, please let me know.
Also, in addition to a link to the Google Calendar version, there is also now a calendar embedded on the page. In the future I may provide this information only in a Google calendar and/or iCal, as the textual calendar is difficult to maintain. If anyone has an opinion on this, I’d be glad to listen. :)