ZAGREB, Aug. 28, 2020 (Xinhua) -- An exhibit with a face mask is seen at Art Zagreb 2020, an annual international contemporary art fair, amid the COVID-19 pandemic in Zagreb, Croatia, Aug. 27, 2020.

LISBON, Aug. 28, 2020 (Xinhua) -- Portuguese President Marcelo Rebelo de Sousa delivers a speech on the opening ceremony of the Lisbon Book Fair 2020 in Lisbon, Portugal, on Aug. 27, 2020. The 90th edition of the Lisbon Book Fair, originally scheduled for May/June, kicked off on Aug. 27 due to the COVID-19 pandemic.

VIENNA, Aug. 28, 2020 (Xinhua) -- Photo taken on Aug. 27, 2020 shows the city view in sunset glow in Vienna, Austria.