Intensive preparations are ongoing in Cairo's Tahrir Square ahead of the expected million-person protests that go under several names, including "Red Card", "Legitimacy to People" and "Last Warning". The protests are called by 21 political and revolutionary groups to demand revoking the November constitutional declaration and postponement of the upcoming public referendum. Marches, including one from Tahrir Square, will be meeting in front of the Ittihadiya presidential palace today. In Tahrir, protesters set up barbed wire and metal barriers at the square entrances outside the Egyptian Museum, Talaat Harb, Falaki and Mohamed Mahmoud streets. Among the groups participating in today's protests are the Free Egyptians Party, Al-Wafd Party, Egyptian Social Democratic Party, April 6 Youth Movement and Addostour (constitution) Party.