The annual Navratri Brahmotsavam celebrations 2017 in Tirumala Tirupati Balaji temple will begin on September 21, 2017 and end on September 30, 2017. During the nine-days of the Brahmotsavams, Sri Venkateswara will be taken in procession around the temple in different Vahanas (special decorated Vehicles based on Vishnu legends). There will be special Unjal Seva during the period.
September 21, 2017 – Dwarjarahanam (Morning) Pedda Sesha Vahanam (Evening)
September 22, 2017– Chinna Sesha Vahanam (Morning) Hamsa Vahanam (Evening)
September 23, 2017 – Simha Vahanam (Morning) Muthyapu Pandiri Vahanam (Evening)
September 24, 2017– Kalpa Vruksha Vahanam (Morning) Sarva Bhoopala Vahanam (Evening)
September 25, 2017 – Mohini Avatharam (Morning) Garuda Vahanam (Evening)
September 26, 2017 – Hanumantha Vahanam and Swarna Ratham (Morning) Gaja Vahanam (Evening)
September 27, 2017 – Surya Prabha Vahanam (Morning) Chandra Prabha Vahanam (Evening)
September 28, 2017– Rathostavam (Morning) Aswa Vahanam (Evening)
September 29, 2017 – Chakra Snanam (Morning) Dwaja Avarohanam (Evening)
More information about various Vahanas during Navratri Brahmotsavam can be found in this earlier article.