Thousands of Egyptian protesters have gathered in central Cairo to press for speedier reforms from the government. Opposition activists have called for a million-person protest in Tahrir Square, the focus of February's uprising.
They particularly want to see ousted President Hosni Mubarak and his officials put on trial more quickly.
There were riots this week over a court decision to bail policemen accused of killing 17 people during the uprising.
People began arriving in Tahrir Square throughout the night to pitch their tents. They were even directing traffic in place of the police who had agreed to stay away to avoid confrontation.
Police and army officers were stationed in the side streets but were not present on the square itself.
Egypt's powerful Muslim Brotherhood opposition movement said it would attend the protest.
"The law is above everyone, and justice has to prevail on all people, young and old," the group's Mahmoud Ghzolan said.
Official figures show that at least 846 people died and 6,000 more were injured in the 18-day uprising during January and February.