Mombasa Governor Hassan Joho will in Nairobi on Sunday.
The governor is jetting into the city to attend an ODM delegates forum after which he will lead high-profile opposition politicians to Mathare for a public rally.
It is however, still not known whether ODM party leader Raila Odinga will attend the rally since he is in Germany.
Raila is in Europe and is expected to meet Germany Chancellor Angela Merkel and deliver lectures at select learning institutions.
A letter sent by Joho to Nairobi Governor Evans Kidero on September 11, said: "This is to inform your good office of my intention to visit Nairobi City County for a delegates forum and a series of roadshows culminating in a public rally in Mathare constituency on Sunday."
"This is following our joint commitment as ODM leaders during the delegates' convention in Mombasa to revitalise, reenergise and popularise our party leader's bid for the presidency in 2017."
The Nairobi events come less than a week after Joho during celebrations to mark ODM's ten years of existence in Mombasa said he would lead opposition MPs in campaigning for Mr Odinga ahead of the 2017 polls.
Among youthful politicians rumoured to join him during the campaigns include Suna East MP Junet Mohamed, Turkana Governor Josephat Nanok, woman MPs Aisha Jumwa (Kilifi) and Mishi Mboko (Mombasa).
Others are ODM chairman John Mbadi, Kajiado Central MP Elijah Memusi Kanchori and Mbita MP Millie Odhiambo.
Nairobi is predominantly an opposition zone having overwhelmingly voted for Dr Kidero and Mr Odinga in 2013.
Mathare, where the rally will take place is represented in Parliament by Stephen Kariuki (ODM) who has hinted joining the newly launched Jubilee Party.