Speaking at the ceremony, Deputy Prime Minister Vuong Dinh Hue spoke highly of the two countries' treasured friendship throughout their struggles for national independence in the past.
Vietnamese volunteer soldiers considered Laos as their second homeland and received great affections from local residents, he added.
The Deputy PM noted the event aims at calling for community support for veterans who are having a difficult life after coming back from the war.
On the occasion, Hue presented gifts to heroic mothers and families of people who rendered service to the nation.
As part of the commemoration, there was a talk show where former Vietnamese soldiers in Laos told their stories.