Since it was asked for events that happened at day of Equinoxes or Solstices, I will let the dates aside. I just like to say that you must take the defernce in the calenders of the shire and the one used today into account.
Events that come to mind: The Dwarves of Thorin left Rivendell at the day after Midsummer (June Solstices).
Gondolin was attacked at the night of Midsummer.
The resurected Doriath under Dior was attacked by the Feanorians at Midwinter.
The Dagor Bergolach was started at Midwinter.
The Nirneath Arnoediad was lunched on Midsummermorning.
So fare what I remeber.
Respectfully
Findegil
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