Greece is scheduled to compete at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. As the progenitor nation of the Olympic Games and in keeping with tradition, Greece will enter first, leading the Parade of Nations during the opening ceremony at the Maracana Stadium.
More information here: https://en.wikipedia.org/wiki/Greece_at_the_2016_Summer_Olympics
