Belated holiday? There's always a holiday somewhere, if you look hard enough...

According to Wikipedia:
  • January 2 : Ancestry Day (Haiti)
  • January 3 : Tamaseseri Festival (Hakozaki Shrine, Fukuoka)
  • January 4 : Independence Day (Burma)
  • January 5 : National Bird Day (USA)
  • January 6 : Epiphany and the beginning of Carnival
  • January 7 : Victory from Genocide Day (Cambodia)
  • January 8 : Commonwealth Day (Northern Mariana Islands)
  • January 9 : Martyrs' Day (Panama)
  • January 10 : Traditional Day (Benin)
  • January 11 : Kagami Biraki (Japan)
  • January 12 : National Youth Day (India)
  • January 13 : St. Knut's Day (the last day of Christmas, Sweden and Finland)
  • January 14 : Ratification Day (United States - the day independence was actually gained, not just declared)
  • January 15 : Tree Planting Day (Egypt)
  • January 16 : Flag Day or Magen David Day (Israel)
  • January 17 : National Day (Minorca)
  • January 18 : Revolution Day (Tunisia)
  • January 19 : Confederate Heroes Day (Texas)
  • January 20 : Martyrs' Day (Azerbaijan)
  • January 21 : Flag Day (Québec)
  • January 22 : Reunion Day (Ukraine)
  • January 23 : Bounty Day (Pitcairn Island)
  • January 24 : Unification Day (Romania)
  • January 25 : Tatiana Day (Russia)
  • January 26 : Australia Day (Australia)
  • January 27 : International Holocaust Remembrance Day
  • January 28 : Data Privacy Day / Data Protection Day
  • January 29 : the feast day of Saint Juniper, "the renowned jester of the Lord"
  • January 30 : Martyrs' Day (India)
  • January 31 : Independence Day (Nauru)
(I had to look very hard for January 3 and 29.)

That should cover us to the chapter's release date... I hope.