From the Facebook page supporting Mir Hossein Mousavi:
Mr. Najar,
Minister of Interior,
Greetings,
Hereby, we request permit to call for a rally --- as Article 27 of the constitution authorizes * --- on Monday, Feb 14, 2011, at 3:00 p.m. (local time) from Imam Hossein Square to Azadi Square (Tehran) to show solidarity with the popular movements in the region and in particular the freedom-seeking movements of the Tunisian and Egyptian people against their autocratic regimes.
Mir Hossein Mousavi and Mehdi Karroubi
*Article 27 provides for freedom of assembly, "provided arms are not carried" and the assemblies "are not detrimental to the fundamental principles of Islam"