Friday the 13th is a special day! Fridays are named for Freya, the Norse goddess of love and fertility ~ a lot like Aphrodite and Venus ~ who are a lot like Ishtar ~ all the Morning Star, the Star of the Sea (Stella Maris), the bright light rising in the East (Venus). Which happens to also be Mary. Visions of the Virgin Mary, Mother Mary, often appear on Fridays. It is traditional to eat fish on Friday ~ fish which comes from the sea, sacred to Venus, born of the sea.
When I lived in Georgia, a vision of the Virgin Mary appeared on the 13th of every month in a town nearby. (Visitors said they smelled the scent of roses shortly before she would appear.)
Why the number 13? There are 13 full moons in a year. Thirteen is a magic witchy number! Have a lucky day!