Rustaveli Avenue, where the rally of the United National Movement will start in a few minutes, is already blocked.
A stage is set up in front of the Parliament, from where the speakers will address the participants.
Some of the protesters gathered on Rustaveli Avenue. Citizens will join the rally in a few minutes, marching from the Republic Square.
Supporters of the UNM arrived in Tbilisi by minibuses from different regions of western Georgia.