This year (2020), Hanukkah starts at sunset on December 9th. While it is not one of YAHWEH's Appointed Times, it is - like His commanded Mo'edim - extremely significant AND all about HIM!
Hannukah serves as a remembrance of the victory of a small band of Jews over the occupying army of Syrian king Antiochus Epiphanes. Antiochus, who came to power in 175 B.C.E. forbade the Jews to practice their religion, and desecrated their Temple...But YAHWEH showed them all who was boss!