Police officers check documents of a restaurant owner on King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

A member of the Royal Concertgebouw Orchestra plays the Dutch Wilhelmus anthem from her balcony to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

The organizers of a neighborhood silent disco are seen on a balcony as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

Women toast at their balcony as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

Police officers check documents of a restaurant owner on King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

Children with Dutch flags painted on their faces react as the Royal Concertgebouw Orchestra plays the Dutch Wilhelmus anthem on a street to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

People toast as they party in an apartment to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

The organizers of a neighborhood silent disco are seen on a balcony as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

A member of the Royal Concertgebouw Orchestra plays the Dutch Wilhelmus anthem to celebrate King's Day (Koningsdag), as she stands on the doorway, during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

Dutch flags hang outside apartments to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

People have drinks in windows of an apartment as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

Students dance on a roof as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.

The organizers of a neighborhood silent disco are seen on a balcony as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

People toast as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.

A woman sits on her balcony decorated to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

The organizers of a neighborhood silent disco lower a bucket with silent disco headphones from a balcony, as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

A woman sits near her mother as she visits her while celebrating King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.

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A woman plays the Dutch Wilhelmus anthem in front of her house, next to her husband and children, to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.

A man toasts as he celebrates King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.

A member of the Royal Concertgebouw Orchestra plays the Dutch Wilhelmus anthem on a street to celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Amsterdam, Netherlands, April 27, 2020.

A man sits with his children in front of their house as they celebrate King's Day (Koningsdag), during the coronavirus disease (COVID-19) outbreak in Nijmegen, Netherlands, April 27, 2020.