instruction: In which cities was the AFL Grand Final played during COVID-19 ?
context: The COVID-19 pandemic affected the scheduling of the match in 2020 and 2021, as outbreaks of the virus in Melbourne during finals precluded unrestricted travel and mass gatherings in Victoria. In 2020, when most of the league's clubs had been relocated to Queensland for the majority of the season, the grand final was played at the Gabba in Brisbane, the first time it had been played outside Victoria. It was also played at night, the first time it was not played in the afternoon time slot. The following season, it was played at Optus Stadium in Perth in a twilight timeslot
response: The AFL Grand Final was played in Brisbane in 2020 and Perth in 2021 due to the COVID-19 pandemic. Usually the AFL Grand Final is played in Melbourne, Victoria.