Graduates pose for a photo during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

Graduates are seen in a car during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

Graduates celebrate during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

People watch concert during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

Graduates sit in a car during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

People watch concert during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)

People watch concert during Riga Technical University graduation ceremony at Spilve Airport in Latvia, July 24, 2020. A drive-in graduation ceremony was held by Riga Technical University in Latvia amid the COVID-19 outbreak. Graduates received their diplomas and enjoyed concert after that. (Photo by Janis/Xinhua)