Tehran Bureau spells it out:
A) a complex logistical scheme is to be implemented whereby the two sides of the Azadi Square from North and East (where the protesters always emerge) will be blocked for several kilometers in each direction. Those on these two sides will be diverted away from the eyes of the international press confined to designated areas within the square. At the same time, supporters will be marshaled en masse from the West and South ends of the square.
B) Two days prior to the ceremonies, the famous inner ring of Azadi Square has been sealed off by special partitions. On the early hours of Thursday morning, the plan is to fill the space with die-hard supporters while checking the bags and pockets of the others wanting to gain entry to the protected zone to make sure they don't carry any Green paraphernalia.
C) Dozens of Basij contingents from the provinces have started arriving in Tehran with each group assigned to one part of the northeast quadrant of the city, using Azadi Square as the reference point.