The celebration, in the party office here, was enthusiastically attended by the party workers across the state, including state unit president Tai Tagak and his team, a party release said.
Tagak thanked the voters of the state for giving a mandate to the party in the state.
"The people of the country have showed their concern for an efficient and transparent government at the Centre where they find BJP as the alternative," Tagak said.
He also assured the people of the state that the party would play effective and constructive role in the state Assembly and outside the floor of the state and would work for ensuring the strong custom and conventions for the spirit of the democracy.