On the Jewish calendar, Yom HaShoah falls on the 27th of the Hebrew month of Nisan, which means the observance will begin at sundown on 26 Nisan.
In the book of Numbers (15:38-39), we read that the Israelites were instructed to "make for themselves fringes on the corners of their garments…that they shall look at it and recall all the commandments of the Eternal and observe them..."
At one time, it was customary for Reform rabbis and cantors to wear robes when leading worship.
The practice of fasting goes back to the biblical verse in Leviticus 26:27, which instructs the people of Israel to "afflict their souls" on Yom Kippur.
Typically, young people are expected to fast once they have become b’nei mitzvah, the age after which they are considered adults in the religious community.