Simplify the following text for a Grade 7 native English-speaking person.
Original: He applies the traditional facial markings to give himself a ghoulish look and even gets a tattoo of a calavera skull on his left arm to celebrate the occasion , a inspired from an Aztec temple bearing the same design . After getting the tattoo , Diego eagerly calls his friends to see if they are to celebrate at the upcoming festival .
Simplified: To celebrate the occasion , he got a tattoo of an Aztec skull days earlier .