You are asked to turn off lights and power down electronics between 8:30 and 9:30 Saturday night.
The global event started in Australia in 2007 by the World Wildlife Fund to raise awareness about the effects of climate change, has grown to include 7-thousand cities.
International landmarks that participated in lights out in 2016 include:
The Eiffel Tower in Paris, France
St. Peter's Basilica in Vatican City, Italy
The Empire State Building in New York City, U.S.A.
The Houses of Parliament in London, U.K.
The Opera House in Sydney, Australia
Niagara Falls, Canada / U.S.A.