The celebrations were held at Rajiv Gandhi Bhawan, here as part of year-long celebration on her 100th birth anniversary.
Floral tributes were placed before the portrait of Gandhi by former Chief Minister Nabam Tuki, APCC President Padi Richo followed by the senior Congress leaders and party's office bearers, a communique informed.
Tuki addressing the gathering recalled the contribution of Gandhi who steered the nation for 15 years as Prime Minister and presented India as a great nation in the world.
The former chief minister said that her famous '20-Point Programme' launched in 1975 was singularly aimed at improving the living standards of the poor masses of the country.
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"Under her leadership, India reasserted its prominent role in the Non-Aligned Movement by focusing on the relationship between disarmament and economic development," he said.
On the occasion, Tuki also strongly condemned the demonetization move taken by the Modi government as anti-people wherein most sufferers are the common poor people.
He said that the tall promises by Modi during last election became an assurance without any result during two and half years of his government rule.
Tuki appealed the party workers to remain united and pursue the Congress ideology at the grass root levels.
Richo in his speech recalled Gandhi's distinguished service to the nation.