Nyinlong in Bhutan
Nyinlong in Bhutan is held on January 2. Or Winter Solstice. Dzongkha: ཉིན་ལོང་, Wylie: nyin long "return of the sun". This event in the first decade of the month January is annual. 
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Nyinlong or Nyilong, the winter solstice celebration, is a public holiday falling on 2 January every year. Nyinlog is considered the most auspicious day of the year. It is celebrated like new year among some western Bhutan, though more so in the central and eastern regions, where the shortest day of the year is marked with archery and feasting. Farmers, on the other hand, may feel some chagrin as the solstice signals longer and longer work days ahead.
Bhutan uses its own calendar, a variant of the lunisolar Tibetan calendar. Because it is a lunisolar calendar, dates of some national holidays and most tshechus change from year to year. For example, the new year, Losar, generally falls between February and March.
Similar holidays and events, festivals and interesting facts
National Day in Bhutan on December 17 (celebrates its National Day on 17 December, in commemoration of the day in 1907 when Gongsar Wangchuk was crowned the first king over a united Bhutan);
Traditional Day of Offerings in Bhutan on January 30 (celebrated on the first day of the twelfth month of the Bhutanese calendar. In eastern Bhutan, the first day of the 12th Bhutanese month is celebrated as a New Year);
King's Birthday in Bhutan on February 21 (Jigme Khesar Namgyal Wangchuk was born on February 21, 1980);
Birth Anniversary of Fifth Druk Gyalpo in Bhutan on February 21 (celebrated until February 23);
Losar, Tibetan New Year on February 28
Death Anniversary of Zhabdrung on April 8 (Zhabdrung Kuchoe, the death anniversary of Zhabdrung Ngawang Namgyel, is a day in Bhutan to pay homage to the Bhutanese leader who first united Bhutan as a nation state. This important day is annually marked on the 10th day of the 3rd month of the Bhutanese calendar);
Birth Anniversary of Third Druk Gyalpo in Bhutan on May 2