In Australia, Australian National Flag Day is celebrated on 3 September. It commemorates the day in 1901 on which the Australian National Flag was first flown. On that day Prime Minister Edmund Barton announced the winners of a competition to design a flag for Australia. A large flag, 5.5 by , was flown over the dome of the Royal Exhibition Building in Melbourne.
Australian flag day is celebrated during the fall.
September is actually spring in Australia because of its position in the southern hemisphere. The system is probably basing its characterization on North American seasons.
( z1 celebrate :ARG1 ( z2 day :mod ( z3 flag :mod ( z4 country :name ( z5 name :op "Australia" ) ) ) ) :time ( z6 date-entity :season ( z7 fall ) ) )