2009
15 December 2009 marked 150 years since Zamenhof's birth, and there were several events to celebrate. On this date, the authorities in Białystok opened a new Zamenhof Center, and a symposium, honoring Zamenhof was held in New York featuring talks by Arika Okrent, Humphrey Tonkin among other professors. The search engine Google bore a special logo (a Doodle) emblazoned with the Esperanto flag in honor of the occasion, which resulted in about 2 million people clicking it to read a Wikipedia article on Zamenhof or Esperanto.
Read more about this topic: Zamenhof Day