Color Day Festival celebrated at Athens Olympic Stadium in Greece
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Aerial photo taken on June 30, 2018 shows a general view of Color Day Festival at Athens Olympic Stadium, Athens, Greece. (Xinhua/Lefteris Partsalis)

Greek famous pop singer Sakis Rouvas performs during Color Day Festival at Athens Olympic Stadium, Athens, Greece, June 30, 2018. (Xinhua/Lefteris Partsalis)

People play with colored flour during Color Day Festival at Athens Olympic Stadium, Athens, Greece, June 30, 2018. (Xinhua/Lefteris Partsalis)

Kids play with colored flour during Color Day Festival at Athens Olympic Stadium, Athens, Greece, June 30, 2018. (Xinhua/Lefteris Partsalis)

People play with colored flour during Color Day Festival at Athens Olympic Stadium, Athens, Greece, June 30, 2018. (Xinhua/Lefteris Partsalis)