Kollywood director Venkat Prabhu will celebrate his birthday at the sets of 'Mankatha' along with the lead actor Ajith. “The special attraction will be the presence of Ajith, along with other stars like Trisha, Premji and Jai. Producer Dhayanidhi Alagiri, who is busy with his marriage arrangements, may also turn up", sources close to the director was quoted as saying. Sources also report that the flick will hit the screens on May 1, during the birthday of Ajith.