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 twenty-ninth of Sivan in Cavaillon. On 29 Sivan 5473 (23 June 1713) a Christian child was found dead and drained of blood. A mob was formed, which stormed the Jewish quarter in Cavaillon looking for any sign of blood in their houses. But none was found, and — miraculously — the total lack of evidence was enough to stop the Jews from being murdered. (Would be nice if that had worked every time there was a blood libel, seeing as there was never any evidence for something that never happened.) To commemorate this close-call escape, the Jews of Cavaillon celebrated a minor festival day, with some additional psalms, an Al haNisim poem by (the otherwise unknown) R. Gad son of R. Judah de Bédarride, and a recitation of the Song of the Sea.