Bangladesh's main opposition party has called for a new nationwide strike on October 10 in a fresh bid to oust the government of Prime Minister Khaleda Zia.
The date coincides with the completion of Mrs. Zia's third year in office.
Awami League leader Sheikh Hasina told the gathering in the capital, Dhaka, the government had failed to run the country and ensure people's security, and that it had to go.
Sunday's rally was attended by tens of thousands of Awami League supporters. It was the first opposition gathering since a deadly grenade attack on a political rally on August 21 killed 20 people.
The Awami League says the attack was an attempt to assassinate Sheikh Hasina and accused the government of involvement. However, the government has denied the accusation.