Olympics Opening Ceremony Tickets

In order to prepare for the entry of the athletes to the stadium, the giant pool of water that had been constructed on the floor of the stadium had to first be drained. 2,162,000 liters of water were drained from the stadium in a time period of 3 minutes, providing a dry, hard surface for the athletes to march and gather on.
Typically Greece leads the Parade of the Nations in any Olympics with the host nation entering the stadium last. However, since Greece was the host nation, they went last, sending only their flag.