President Uhuru Kenyatta will first attend the Jubilee party NDC at KICC, Nairobi, before heading to Kasarani gymnasium for the ODM's meeting.
The President began the day by chairing the National Executive Committee meeting at State House before heading to the NDC at KICC.
He will later have a joint NDC with the ODM party.
The joint meeting is expected to be Raila's defining moment since the event will see him endorsed as Azimio La Umoja presidential candidate.
A host of leaders are expected to attend the NDC.
According to the designated sitting arrangements at KICC, seats have been reserved for Raila, Wiper leader Kalonzo Musyoka, KANU's Gideon Moi, Narc Kenya Martha Karua and UDP's Cyrus Jirongo.
The reservation of seats hints at a possibility of the ODM leader heading to KICC after his Kasarani meeting.
Governors, MPs, Senators and MCAs among other leaders are expected to attend also.
