Knights of Walpurgis was going to be what JK Rowling originally called the Death Eaters. I also think (no source, just speculation) that the final battle was supposed to be on April 30th originally, also known as Walpurgisnacht. But she changed it.
In Germany, Walpurgisnacht, the night from 30 April to 1 May, is the night when witches are reputed to hold a large celebration on the Brocken and await the arrival of spring.
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