"Holiday" was released on November 13, 2020, through Columbia Records, as a standalone single. A preview of the song, titled "The Origins of Holiday", was released on November 8. It is a Christmas-themed song, described as a stopgap single between his debut EP 7 and follow-up single "Montero (Call Me by Your Name)" or the real beginning of the MONTERO album era.
The music video for "The Origins of Holiday" trailer was directed by Jason Koenig, and produced by Ron Perry, Saul Levitz, Bridgitte Pugh. It has Lil Nas X overtaking the identity of Santa Claus, in a fashion similar to Tim Allen's character in the 1994 film The Santa Clause, and features Michael J. Fox as the character of Marty McFly from the Back to the Future film series.
The music video for "Holiday" was directed by Gibson Hazard and Lil Nas X, and features Lil Nas X as a futuristic Santa Claus in his workshop on December 24, 2020.
More videos were made. Here are two samples:
On November 10, 2020, Roblox announced the "Lil Nas X Concert Experience", that began on November 14, 2020, at 1pm PST. The concert was used to promote the single, with Lil Nas X singing a variety of his popular songs through a large avatar. The event was widely considered a success, with it receiving 33 million views.
Lil Nas X extended the Santa character of the clip into a parody for Jimmy Fallon's show.
Source, details and references: https://en.wikipedia.org/wiki/Holiday_(Lil_Nas_X_song)