Supporters of the Iranian monarchy held a demonstration in Washington, D.C., outside the White House

The choice of April 13th as the date for the demonstration might hold specific significance for the participants. It could coincide with a historical anniversary related to the Iranian monarchy, a date of political importance within the opposition movement, or simply a strategically chosen time to maximize media attention and impact. Understanding the specific rationale behind the chosen date could provide further insight into the organizers' motivations and the broader context of the event.