The event was held to celebrate the 40th anniversary of the liberation of South Vietnam and National Re-unification (April 30) and mark the 55 years since the three cities set up their partnership.
The unity of people from three localities contributed significantly to Vietnam's great spring victory, which brought about complete independence and reunification for the country.
The event was held separately on April 11 at the National Museum of Vietnam History in Hanoi, Ngo Mon Square in Hue, and Reunification Hall in HCM City.
Prominent at the event were Le Thanh Hai, the Secretary of the HCM City Party Committee; former Vice State President Truong My Hoa, mothers of Vietnamese war martyrs, war veterans and overseas Vietnamese.
The programme recalled a number of historic events during the country's struggle as told through eyewitnesses.
In 1960, a ceremony was held where the three cities sisterhood with each other.
People from Hue offered people from Hanoi and Saigon (now HCM City) a large embroidery painting entitled Hanoi-Hue-Saigon: Trees from the Same Root, Children of the Same Family.
When the country was at war, northern young people volunteered to leave villages to go fighting in the South. Those who stayed home worked hard to supply logistics for the battle fields. In the South, diverse campaigns broke out to protest against the United States' war of destruction against the North.
The Great Victory in 1975 in which the Ho Chi Minh Campaign liberated Sai Gon continued to affirm the nation's aspiration for reunification.