Wikipedia Day has been celebrated, both online and offline, for several years. Last year, there was a big worldwide celebration of Wikipedia 10, and it is hoped that this tradition can be continued with diverse local meetups and wiki-events for Wikipedia Day on Sunday 15 January 2012.
Wikipedia Day 2012 
- Australia (Melbourne, possibly others)
- Czech Republic
- Meeting of Wikipedians from Lörrach in Basel (see Switzerland)
- Wikimedia India Eleven page (several events)
- Meeting in Basel w/ Wikipedians from Lörrach (see Germany)
- Add other countries here...