Didn't know what a couple of these mean so I asked Gemini. Not so sure about the accuracy of some though. 

Jan 3: Bitcoin Genesis Day: This marks the day when the Bitcoin network went live in 2009.
Jan 11: Bitcoin Running Day: A playful nod to the idea of "running" Bitcoin nodes, which are crucial for the network's operation.
Jan 27: Silk Road Day: Refers to the launch of the Silk Road, an online black market that primarily used Bitcoin for transactions.

Feb 24: Mt Gox Day: This day commemorates the collapse of Mt. Gox, which was once the largest Bitcoin exchange.

Mar 9: Cypherpunk Day: A tribute to the Cypherpunks, a group of cryptographers and computer scientists who advocated for privacy and encryption.

Apr 5: Satoshi's Birthday: Celebrates the presumed birthday of Satoshi Nakamoto, the pseudonymous creator of Bitcoin.

May 10: Lightning Day: Highlights the Lightning Network, a layer-2 scaling solution for Bitcoin that enables faster and cheaper transactions.
May 22: Bitcoin Pizza Day: Commemorates the first purchase made with Bitcoin, which was two pizzas for 10,000 BTC.
May 25: Craig Wright is a Fraud Day: A humorous jab at Craig Wright, who claims to be Satoshi Nakamoto but has been widely discredited.

June 22: Bitcoin Shopping Day Go Spendl! Encourages the use of Bitcoin for everyday purchases.

Aug 1: Bitcoin Independence Day: Celebrates Bitcoin's independence from traditional financial systems.
Aug 21: Bitcoin Infinity Day: A day to reflect on Bitcoin's potential for the future.
Aug 28: Feast of Saint Hal: A tribute to Hal Finney, an early Bitcoin adopter and developer.

Oct 1: Free Ross Day: Advocates for the release of Ross Ulbricht, the founder of the Silk Road.
Oct 31: Bitcoin Whitepaper Day: Marks the publication of the Bitcoin whitepaper by Satoshi Nakamoto.

Nov 1: Diffie-Hellman Day: Honors Whitfield Diffie and Martin Hellman, who invented public-key cryptography, a fundamental technology used in Bitcoin.
Nov 8: Shitcoin Day: A tongue-in-cheek day to poke fun at altcoins.

Dec 18: HODL Day: Encourages long-term holding of Bitcoin, derived from the misspelling of "hold" in a famous Bitcoin forum post.