Just for those interested.
It's the night that witches are out and about (30th April).
Does any-one know any-thing else about it?
http://www.nationmaster.com/encyclopedia/Walpurgis-Night
http://www.whatsonwhen.com/events/~11501.jml
http://www.hass.org.uk/culture.php?page=walp_night
http://www.serve.com/shea/germusa/walpurgi.htm
