The conclave to elect a new pope begins tomorrow, May 7th, which is the Memorial of the Apparition of the Holy Cross over Jerusalem.

Quote: "Commemorates the appearance on 7 May 351, Pentecost that year, of a luminous image of the Holy Cross in Jerusalem. It stretched from Mount Golgotha to the Mount of Olives (about two miles / three kilometers), was brighter than the sun, lasted several hours, and was seen by the entire city. It led to many conversions, and was reported in a letter attribued to Saint Cyril of Jerusalem."

Source: https://catholicsaints.info/apparition-of-the-holy-cross-over-jerusalem/

Most recent conclaves have been over with in 2 days. May 8th is a feast day of an Apparition of St. Michael the Archangel.

Quote: "This feast day commemorates the 5th-century appearance of the Archangel in Monte Gargano, Italy, near a cave now known as the Sanctuary of St. Michael."

Source: https://catholiccompany.com/getfed/did-you-know-that-st-michael-has-a-feast-day-in-may/