Iran: Students Protest Dictatorship and Gender Apartheid · Global Voices
Fred Petrossian

Photo is from yaarinews.com
A group of students held a protest rally against the Iranian government and president Mahmoud Ahmadinejad at the University of Tehran on Sunday to commemorate Student Day, the anniversary of the murdering of three students of University of Tehran on December 6, 1953.
Daftare Tahkim Vahdat (means the Office of Consolidation of Unity), an important student association, had organised this demonstration to protest against censorship, gender apartheid and pressure on students. They chanted slogans such as “Down with the dictatorship” and clashed with security forces. You can see a collection of photos here.
Here is a video on the demonstration:
Salam Demokrat says that students who had been in jail or deprived of studying delivered speeches at the university. The blogger adds:
در ادامه سخنرانی ها دانشجوی منع تحصیل و زندانی آزاد شده، مهدیه گلرو، از دانشگاه علامه
در مورد جنبش زنان و خاطرات زندان خود سخن گفت و مورد تشویق و پشتیبانی فراوانی از دانشجویان قرار گرفت. بعد از خانم گلرو، دانشجویان کرد، بیانیه ی خود را خواندند. و دانشجویان سوسیالیست دانشگاه های ایران و دانشجویان سوسیالیست پلی تکنیک بیانیه های خود را توزیع کردند
The blogger adds that the number of students was between 3000 to 4000.
See more photos here.