“'Spy Wednesday,' the day Judas decides to betray Christ. A Tenebrae (darkness) service is sometimes held this day, in which all the light in the sanctuary is extinguished. Start the Rosary or night prayer with several lit candles; extinguish them halfway through." Link.
I'll have to tell my youngest daughter, who celebrates her 11th birthday today, that she shares her day this year with Judas.