Taco John's has abandoned its trademark registration for "Taco Tuesday", returning the phrase to the public. The notice of abandonment was submitted on July 18, 2023, before the United States Patent & Trademark Office's Trademark Trial and Appeal Board.
https://www.jdsupra.com/legalnews/it-takes-two-to-taco-taco-john-s-2124500/
https://www.jdsupra.com/legalnews/it-takes-two-to-taco-taco-john-s-2124500/