It may be noticed that Perumal is Present during Dwajarohanam in the morning. At Thiruppullani, Raman uthsavam commences only with the kadaksham and anugraham of Perumal. In the evening Satrumurai also Perumal Will be present with Raman and only after offering mariyadhais to Perumal, mariyadhais will be offered to Raman. And Perumal Will accompany Raman during thiruveethi purappadu also thereby extending His anugraham for the festival of Rama, Who was born only due to the Blessings of Perumal to King Dasaratha.
Details of the utsavam can be read from: http://anudinam.org/2012/04/21/chitthirai-brummothsavam-at-thiruppullani/
Sri Raman Lakshmanan and Seethai during evening saatrumurai
Thanks to T. Raguveeradayal Swami of Thirupullani