As I know from personal experience, it can be embarrassing when you get your dates wrong. But there are some dates you'd think some people would get right:
Around 60 people turned up to celebrate the Winter Solstice at Stonehenge - on the wrong day.Serves 'em right for not reading Stuart's Astronomy Blog. ;)
After negotiating with site-managers English Heritage, the crowd performed traditional solstice activities on Thursday morning, and left peacefully.
One reveller, who wished to remain anonymous, said: "We formed a ring and held hands, and touched the stones. The man with the green cloak was there.
"But there were an awful lot of red faces," she said.