AIADMK is facing an internal challenge following vote share declines in recent byelections to Madurantakam and Dharapuram reserved constituencies.
Critics are expected to question general secretary Edappadi K. Palaniswami's leadership around the party's Foundation Day on October 17.
The party secured about 25% of the votes in both constituencies, impacted by shifted alliances and the emergence of the Tamilaga Vettri Kazhagam.