Earth Hour 2013

• The Danish royal palaces, Amalienborg Palace and Gråsten Palace, went dark at the Queen's command.
• Nelly Furtado held a free concert at Nathan Phillips Square in Downtown Toronto to celebrate Earth Hour.
• In Toronto, Ontario, York University's student-run Environmental Outreach Team ran an afternoon Earth Hour information session, and the York University Observatory offered an extra public viewing session.
• Stargazing activities were held in Toronto's Ontario Science Centre and Richmond Hill's David Dunlap Observatory.