The Southern Highlands Botanic Gardens celebrated Earth Hour on Saturday.
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As it was Earth Hour, the event was held from dusk into the darkness before 'lights out'.
The event attracted community groups and families who enjoyed a picnic or other refreshments.
Kids learned how to make a solar powered lantern, took part in a "lantern parade" through the gathered picnickers and generally ran around enjoying themselves.
Live music entertained everyone, and stalls were available for people to meet local renewable energy providers.
CEO Charlotte Webb said the highlight was an attempt to achieve a Guinness World Record for the largest display of solar lanterns.
"We set up a display of over 1200 solar lanterns in the shape of a footprint in a large space of open ground in the Botanic Garden," Mrs Webb said.
Once it was dusk, two independent witnesses did an official count of the lights and that counting process was recorded by video.
A drone took photos of the lights at dusk and again in the dark, showing the glowing footprint.
"We now have to collect the documents, photos and videos supporting our attempt and send them off to Guinness World Records for assessment," Mrs Webb said.
The official result for the solar lanterns display will be known in the coming months.
