The Seder ha-Tamid, a Provençal (Nusaḥ Comtat Venaissin) siddur published in Avignon in 1766, has liturgical additions for an amazing five different local festivals — one for Avignon, and two each for Carpentras and Cavaillon. Here’s a series of piyyutim for the fifteenth of Kislev in Carpentras. On 15 Kislev 5273 (24 November 1512 Julian), a troop of armed men entered the Jewish quarter in Carpentras. While we don’t know much else beyond that, we do know that this was a terrifying enough occurrence to the Jews of Carpentras that when the armed men left, a holiday was declared with multiple piyyutim and a full recitation of Hallel.