Henna is also used for this social celebrations. If there is a joyous festival, you can guess that henna is probably a part of it! For Hindus, henna is must for the celebration of Karwa Chauth, a holiday for married couples. Wives fast for the entire day and pray for their husbands long life and prosperity, and also get henna and presents; it's a romantic holiday. Having henna reminds them of their wedding day.