Kwibuka serves as a tribute to the more than 800,000 people killed by the genocide.
The Nigerian leader, who returned to Abuja on Tuesday evening, extended his stay in London after the coronation by one additional week on health grounds.
Mr Gambari said Mr Buhari does not ‘use and dump’ his subordinates like “typical politicians.”
The presidency said the budget would address urgent security and COVID-19 needs of the nation.
Vice-President Yemi Osinbajo on Saturday led other top government functionaries to the coronation of Emir of Kano, Aminu Ado-Bayero.
