Friday the 13th one occurrence each. A Friday the 13th occurs during any month that begins on a Sunday. The fear of the number 13 has been given a scientific name: "triskaidekaphobia"; and on analogy to this the fear of Friday the 13th is called "paraskevidekatriaphobia", from the Greek words "Paraskeví" (Παρασκευή, meaning "Friday"), and "dekatreís" (δεκατρείς, meaning "thirteen"). The superstition surrounding this day may have arisen in the Middle Ages, "originating from the story of Jesus' last supper and crucifixion" in which there were 13 individuals present in the Upper Room on the 13th of Nisan Maundy Thursday, the night before his
Friday the 13th motorcycle rally Friday the 13th motorcycle rally The Friday the 13th Motorcycle Rally is a motorcycle rally held every Friday the 13th in Port Dover, Ontario, Canada since 1981. Its typical summer attendance exceeds 100,000 bikers. The event has been described as "the biggest single-day motorcycle event in the world," a title also claimed by the Rolling Thunder rally in the United States. Although hundreds of attendees arrive during winter months, attendance is at its highest when the date falls on a summer day. In August 2010, the rally drew more than 150,000 attendees. Estimates for the July 2012 event ranged from