July 1 is the Day of the voluntary entry of Buryatia into Russia.
In 2011, the 350th anniversary of the voluntary entry of Buryatia into the Russian state was celebrated on a grand scale. This holiday date was approved by the law of the Republic of Buryatia dated March 11, 2011.
Interestingly, the scientific debate around the very figure "350 years" dragged on for a very long time. Opponents of this date referred their opponents to the works “A Chronological List of the Most Important Data from the History of Siberia in 1032-1882” and “The Complete Collection of Legislative Acts of the Russian Empire from 1649 to 1913”, where, according to them, there is no hint of the exact date of Buryatia’s entry into composition of the Russian Empire. As, however, there is no Buryatia itself on any of the maps of Russia or foreign states of that period.