Thank you MijRai, belaran & Rosa!
I'll blend them into my calendars.

EDIT: Current calendar made:
January
- 1: New Year's Day
- 12: India Rivers Purificiaion (India; REF: 2012)
- 13: UGE's Appearance (REF: 2011, elf/dwarf)
- 17: EuroWars Start (Europe, REF: 2031)
- 27: Dunkelzhan's Waking (REF: 2012)
February
- 1: Universal Brotherhood Created (Ref: 2043)
- (first week): Fashion Week (Outremer, Vashon Island) (Ref @ Emerald Shadows)
- 7: Remembrance Day (Night of Rage) (Tacoma, Puyallup) (Ref @ Emerald Shadows)
- 7: Night of Woe (Night of Rage) (Seattle Underground) (Ref @ Emerald Shadows)
- 8: Chinese New Year
- 8: Night of Stars (Auburn) (Ref @ Emerald Shadows)
- 8: The First Crash (Ref: 2029)
- 10: Alamo 20k Bombing of the Sears Tower (Ref: 2039)
- 14: Valentine's Day
- (last Friday): Snowflake Festival (Bellevue) (Ref @ Emerald Shadows)
March
- (two weeks around the vernal equinox): Snohomish Spring Fest (Snohomish) (Ref @ Emerald Shadows)
- ~14: St. Patrick's Day
April
- 25: NAN's Formation (Ref: 2018)
- (middle): Petrowski Farms Appreciation (Puyallup) (Ref @ Emerald Shadows)
- 30: Goblinization Day (Ref: 2021, orks & trolls)
May
- (first week): Fashion Week (Outremer, Vashon Island) (Ref @ Emerald Shadows)
- 5: First Public Magician's Lodge (Ref: 2015)
- 8: Mother's Day
- (second Sunday): Boeing Days (start) (Auburn) (Ref @ Emerald Shadows)
June
- 1: Asamando's Founding (Ref: 2030)
- 2: Jerusalem's Abandonment (Ref: 2046)
- (first weekend): Emerald City Music Festival (Downtown) (Ref @ Emerald Shadows)
- 19: Father's Day
- 20: Summer Festivals (start) (Snohomish) (Ref @ Emerald Shadows)
- ~20: June Solstice
- 21: National Aboriginal Day
July
- (early): Fleet Week (Everett) (Ref @ Emerald Shadows)
- 29: Get Stuck (Auburn) (Ref @ Emerald Shadows)
August
- (first week): Fashion Week (Outremer, Vashon Island) (Ref @ Emerald Shadows)
- 9: Dunkelzhan's Presidental Day (Ref: 2057)
- 17: Anniversary of Mt. Rainier's Eruption (Puyallup) (Ref @ Emerald Shadows)
- 17: Great Ghost Dance (Ref: 2017)
September
- 5: Halley's Comet Appearance (Ref: 2061)
October
- 15: UCAS Day (ref: 2030)
- 25: Liberation Day (CalFree)
- 31: Harvest Fest (end) (Snohomish) (Ref @ Emerald Shadows)
- 31: Halloween (with Halloweeners) (Redmond) (Ref @ Emerald Shadows)
November
- 2: Crash 2.0 (Ref: 2064)
- (first week): Fashion Week (Outremer, Vashon Island) (Ref @ Emerald Shadows)
- 16: Humanis Policlub formed (Ref: 2046)
- 27: Snowflake Celebration (start) (Bellevue) (Ref @ Emerald Shadows)
December
- (second Monday): Indigenous Peoples Day (Council Island) (Ref @ Emerald Shadows)
- 15: Renraku Arcology Shutdown (Ref: 2059)
~ 21: December Solstice
- 24: Official Awakening (Ref: 2011)
- 24: Snowflake Celebration (end) (Bellevue) (Ref @ Emerald Shadows)
- 24: Christmas Eve
- 25: Christmas
- 26: Boxing Day
- 31: New Year's Eve
?
- ? (Sunday): Super Brawl Sunday (Everett) (Ref @ Emerald Shadows)
- ? (Friday): Black Friday (Renton) (Ref @ Emerald Shadows)
- ? (Memorial Day): Boeing Days (end) (Auburn) (Ref @ Emerald Shadows)
- ?: Summer Festivals (end) (Snohomish) (Ref @ Emerald Shadows)
- ? (autumnal equinox): Harvest Fest (start) (Snohomish) (Ref @ Emerald Shadows)
- (longest night of the year): Longest Night Festival (Snohomish) (Ref @ Emerald Shadows)
- (third Monday of each month): Black Mondays. (Redmond) (Ref @ Emerald Shadows)
- ? (mid to late spring): Planting Festival (Outremer, Fox Island) (Ref @ Emerald Shadows)
- ? (per specific apple falling): Falling Apple Festival (Outremer, Fox Island) (Ref @ Emerald Shadows)
- ? (mid summer): Fisher's Fortune Festival (Outremer, Fox Island) (Ref @ Emerald Shadows)
Updates/corrections/revisions welcome.
~AB