Event type: Birthday party. Location of henna tattoo: As requested by guest. Number of guests needing henna: 20-40. Age of guests: 4-6 years old, 6-10 years old, 10-14 years old, 14-17 years old, 18 and older.More info: I'm turning 40 and we're having a simple get together brunch with maybe 10 families. I would love to add henna to make it special and memorable for my guests. Thanks!