Penult

The sixth and penultimate day of Kwanzaa (United States)

Twelve Days of Christmas

The seventh of the Twelve Days of Christmas (Western Christianity)

Hogmanay

New Year's Eve (International observance), and its related observances:
The first day of Hogmanay or "Auld Year's Night" (Scotland)

Ōmisoka

New Year's Eve (International observance), and its related observances:
Ōmisoka (Japan)

Russian New Year celebration

New Year's Eve (International observance), and its related observances:
Novy God Eve (Russia)

Public holidays in the Philippines

New Year's Eve (International observance), and its related observances:
Last Day of the Year or Bisperás ng Bagong Taón, special holiday between Rizal Day and New Year's Day (Philippines)

First Night

New Year's Eve (International observance), and its related observances:
First Night (United States)

International Solidarity Day of Azerbaijanis

International Solidarity Day of Azerbaijanis (Azerbaijan)

December 31 (Eastern Orthodox liturgics)

Christian feast day:
December 31 (Eastern Orthodox liturgics)

Pope Sylvester I

Christian feast day:
Pope Sylvester I (Catholic Church)

Johnnie Walker (DJ)

Johnnie Walker, British radio DJ (born 1945)

Arnold Rüütel

Arnold Rüütel, Estonian politician, 3rd President of Estonia (born 1928)

Cale Yarborough

Cale Yarborough, American Hall of Fame racing driver and founder of Cale Yarborough Motorsports, NASCAR Cup Series champion (1976, 1977, 1978) (born 1939)

Barry Lane

Barry Lane, English golfer (born 1960)

Pope Benedict XVI

Pope Benedict XVI, German Roman Catholic cardinal and theologian, pope (2005–2013) and archbishop of Munich and Freising (1977–1982) (born 1927)