No, that's not a church-related holiday: it's a roundup of frugality articles, and this week's gathering is posted here.
One of the posts referenced an article in Toronto's Globe and Mail newspaper, about people around the world buying a week's worth of groceries. I couldn't find the specific link on the Globe and Mail site, but it was obviously referring to Peter Menzel and Faith D'Aluisio's finally-released book Hungry Planet: What the World Eats (Ten Speed Press). Similar to the premise of Menzel's book Material World, they asked 30 families "to buy a week's worth of groceries and display it for the camera. A Darfur family had the most meager, with grains, sugar and salt provided by the United Nations and supplemented with purchases of limes, onions, spices and dried tomatoes. Most abundant was a German family cache of breads, fresh produce, meat, beer, milk and pizza for $494.19."
An online article I did find says that excerpts from Hungry Planet are available on Menzel's website.