Why did inauguration ceremony take place in the amphitheatre formed by the Union Building in Pretoria?

Why did inauguration ceremony take place in the amphitheatre formed by the Union Building in Pretoria?

Answer: It was the first democratic, non – racial government that took oath in South Africa. The ceremony was attended by the dignitaries from more than 140 countries around the world and thousands of the people of South Africa of all the races to make the day memorable. So, it took place in the amphitheatre formed by the Union Building in Pretoria.