The planned unveiling of a spokesman for the Luhya community at is under way at Bukhungu Stadium in Kakamega County.
A bullfight contest is currently in progress witnessed by a large crowd.
Tight security is in place with police officers frisking those entering the venue.
Cotu boss Francis Atwoli and other leaders expected to arrive shortly.
A spectator was injured in stampede after fighting bulls charged at the crowd in the stadium. He was rushed hospital in a police vehicle.
The initiative by Mr Atwoli, a trade unionist, has elicited mixed reactions and sparked off intense speculation from leaders in western, which is considered a key swing vote region.
An endorsement as spokesman is likely to be a major boost to either Amani National Congress leader Musalia Mudavadi, Ford Kenya’s Moses Wetang’ula or Kakamega Governor Wycliffe Oparanya.
Mr Atwoli said he had sent invitations to governors, senators and MPs who were supporting his initiative.