My response to your predictions:
Why would Sai adopt Vinu? What are the grounds for adoption? Vinu is settled in a complete family whose income is much higher than Sai. If Virat takes the legal route, he has more chances to win. (Keep aside the legality of the original adoption)
IF spoiler says Sai doesn't allow Saavi to go but IF also says that Vinu locks himself in a room. So that’s where Sairat and Patralekha will be majboor and inadvertently end up in Chavan Niwas for anniversary
If Savi wears black dress for anniversary, toh samajh lo ki Savi revelation is happening. Also, then before that, even the humiliation that I mentioned yesterday has chances.