The tradition view
Many families are comfortable with Sunday if the panchang and priest agree. It is not treated like Amavasya or Pitru Paksha in the same way.
The RWA reality
This is where Sunday gets tricky. Some societies stop full shifting on Sunday, some allow only fixed slots, and some need guard-office approval in advance.
The price view
Sunday can be less intense than Saturday, but it is still weekend demand. Ask for a weekday benchmark before paying advance.