I like puns, and the title is a bit of one. Prior to 1960, the Feast of the Invention of the Cross was celebrated on May 3. “Invention” here means “finding,” specifically St. Helena’s discovery of the True Cross when she visited Jerusalem in the early 300s. We still celebrate the Feast of the Exaltation of the Cross on September 14, which commemorates the (wicked, by the way) Emperor Heraclius’ recovery of the True Cross from the Sassanid Persians in 600s. Prior to Vatican II, the liturgical wreckers at the Vatican decided that the Holy Cross by which Our Lord and Savior Jesus redeemed the world deserved only one feast day, not two, so they deleted the Invention of the Cross. Look in your 1962 Roman Calendar, and you will not find it.
Which is sad. Because however unpopular a kind-of-sort-of duplicative feast day might be to closeted Freemasons in Rome, there is likely some group of Catholics somewhere in the world for whom that is their patronal feast. In certain parts of Mexico and the United States, Catholics of Mexican ancestry traditionally celebrated the Invention of the Cross on May 3 by performing the matachines, a type of ritual dance with Native American origins.
You can find a lot of videos of these dances on YouTube if you search for matachines. Here’s a video showing matachines dancers apparently dancing in honor of the Holy Cross. Click here for information about the matachines and their traditional celebration in Texas on May 3.