Doing some research, I learned that it was a reference to the "ritual of tarantella", a folk dance celebrated annually on June 29th with a big festival dedicated to Saints Peter and Paul. Its origin is actually bizarre, the tarantati (people who were victims of the tarantula bite) used to go to Galatina to dance all together and the next day they used to go in the church to be blessed and healed by the two Saints. (note: not the same type of tarantula that we are familar with)