Ankurarpanam (planting 9 grains in soil placed in earthen dishes).

Kankanadharanam (wrist band) to Utsava Muthi and priests.

Procession of Vishvaksenar (Commander-in-chief of Vishnu’s army).

Mritsangrahanam- Collecting the soil for Brahmotsava Yagna(Hawan, Fire

ceremony) Peetam.

Vishvaksenar returns from procession and enters the Yaga Shaala (Place

where

Yagnam is conducted), where he is received with Poorna Kumbham

honor(special

Pot filled with water).  He is believed to be the Pradhana Yajaman (Chief

conductor) of  this Yagnam. This is followed by Procession of Deity on

Pedda

Sesha (Bid serpant) Vahanam.

The first day of the festival is known as “Dhwajarohan” whereupon the Garuda flag is hoisted near the Srivari Alaya Dhwajasthambham signalling the official start of Brahmotsavam. Garuda (Eagle), officially visits heaven (Devalokam) and invites all the Lords (Devas) to the Brahmotsavam.  God Venkateshwara on Pedda Seshavahana (Snake) is taken in a procession around the four street (maada streets) around evening time and the whole event lasts until midnight. 

Sri Ananta Sesha & Sri Garuda attending the flag hoisting ceremony

http://sandeepnadendla.com/Venkateswara.aspx