What is the day today?
Wikipedia Day!
Wikipedia Day is celebrated on January 15 of each year since 2001, on the anniversary of the birth of Wikipedia.
Wikipedia Day has been celebrated, both online and offline, for several years. Last year, there was a big worldwide celebration of Wikipedia 15, and it is hoped that this tradition can be continued with diverse local meetups and wiki-events for Wikipedia Day on Sunday 15 January 2017.
anniversary [ ˌænɪˈvɜːsəri ] годовщина;
worldwide [ ˌwɜːldˈwaɪd ] Всемирный;
meetup [ miːt ][ ʌp ] случайно встретиться