A gathering of many persian people in one convenient location, usually lasting until 3 in the morning. Typically involving dancing, playing poker, and eating kabob with tadiq. And once a year in March there is a major gathering of every persian in the local area and they party all night, it is called Chahārshanbe Sūrī.
"Hey Adi, salam aleikom. Do you know vere de pershfest iz tonight, azizam?"