Palaniswami, also the Headquarters Secretary of the AIADMK (Amma) faction, will host the Iftaar function at the Chennai Trade Centre here on June 21, a party release said.
Last year, late Chief Minister J Jayalalithaa had hosted the event.
In a series of developments since Jayalalithaa's death on December 5 last year, AIADMK has suffered a split, with Palaniswami and his predecessor O Panneerselvam leading the respective factions.
Incidentally, a section of MLAs in the ruling party are rallying behind Amma faction Deputy General Secretary TTV Dhinakaran, who is out on bail in a bribery case.