There’s a useful set of advice and links here on holding green events, from the London Sustainability Exchange http://www.lsx.org.uk/news/hottopics.aspx?id=3061
Home Alone February 23, 2007
When my Auntie went out in the evening she always used to leave the heating and the lights on for the sake of her cats. She worried that she’d return to find them stiff with cold, and hungry because they wouldn’t be able to see their way into the kitchen in the dark for their crunchies. Well, most of us know that cats don’t need night-vision goggles but you could knit yours a dinky blanket. This one is donated by my mother-in-law.