Wikipedia says, The Celebration of the Persian Empire
The Ministry of the Court placed the cost at $17 million (at that time); Ansari, one of the organizers, puts it at $22 million (at that time).[7] The actual figure is difficult to calculate exactly and is a partisan issue, but may have exceeded $200 million.[citation needed]
What was the cost of the party? I see the celebration often cited as a source of discord at the time.