It’s Chahar Shanbeh Suri چهار شنبه سوری (Tuesday March 17 2015)! This is traditionally known as the Festival of Fire and is celebrated on the eve of the last Wednesday of the year and serves as a prelude to Nowruz. It is a festival rooted in the beautiful and ancient Zoroastrian religion and involves jumping over a small bonfire to wish away illness for the New Year and hope for the energy and vitality of the fire as a purification ritual.
Another tradition on this night is Ghashogh Zani قاشق زنی which is very similar to the Halloween trick or treating. Ghashogh zani (ghashogh means spoon and zani means striking). This tradition is rooted in the belief that the living were visited by the spirits of their ancestors on the last day of the year. So children pretend they are the ancestors and disguise themselves in shrouds going door to door striking pots with spoons to rid the bad luck and are offered treats.