EDMONTON — Mother Nature upstaged Mother Earth in Edmonton this weekend.Earth Day celebrations in the Albertan capital that were planned for Sunday have been postponed because of the cold weather.Organizer Janice Boudreau said exhibitors and entertainers had been pulling out all week as forecasts announced snow and freezing winds.”They did it last year, but they didn’t want to do it again,” she said. “This is supposed to be an enjoyable experience for everyone.”The organizing team will meet Monday to pick a new date, hopefully one during May or June.Boudreau made the decision to put the event on hold on Saturday.”Our philosophy is any day is Earth Day,” she said. “This was not an easy decision to make.”April 22 was International Earth Day.