Conversation so far:
What is henna in regards to Arab Weddings?
A woman draws henna or mehndi, a temporary form of skin decoration using henna, on the bride and guests' skin — usually the palms and feet
Is there any special meaning to the designs of henna made on the bride and guests' skin?
The designs are very intricate. Often hidden within the mehndi pattern, the name or initials of the groom are applied.

Question: How far back does this tradition of henna go ?
Self-contained rewrite: How far back does the tradition of henna night go?