The Senate had threatened to boycott plenary if INEC does not conduct Rivers inconclusive elections by December 10.
Secretary to the commission, Auguta Ogakwu, said this in a statement issued in Abuja on Thursday, November 3.
According to her, the commission has also approved December 3 to conduct election for the vacant Ifako/Ijaiye seat of Lagos state in the house of representatives.
The seat became vacant following the death of Adewale Oluwatayo, the member who represented the constituency in the house, in July.
The statement said the commission will also conclude rescheduled councillorship polls in some area councils in the federal capital territory.
It said: "After months of intensive planning and wide consultations, the Independent National Electoral Commission on Thursday approved the conduct of Lagos’ house of representative election on Saturday, December 3, 2016.
"Federal Capital Territory councillorship election will also hold on Saturday, Dec 3, 2016.
"Rivers, national assembly (senate and house of representatives) and state house of assembly elections on Saturday, Dec. 10, 2016."
The Senate had on Wednesday threatened to suspend sittings if INEC fails to conduct the pending elections in Rivers state by December 10.