This reminded me of my FYP defence. Our group discussed our FPY in advance with professors for brain storming. On time of defense all three of our teachers were those who taught us and help us to prepare for defence.

Our FYP defence didn't even lasted 5 mins and they told us to leave and approved as all the discussion was already conducted.

Also, we don't have dress up culture too strictly like your culture. We can wear casual dress too.

!1UP