What if the Castle Mitternacht adventures are coming on the date of the actual Walpurgisnacht celebrations? In that case, we only have to wait 2 more weeks, as Walpurgisnacht comes on April 30th, followed by a festival on May 1st. I think that would be really cool.
This was speculated back in February and then the first reaction was this: I'm just happy we got two new Mauve Manticores and AA items before the end of April.
It's the eve of the feast of Saint Walpurga. Walpurgisnacht is, according to Germanic folklore, the night when witches meet on the highest peak in the Harz Mountains. https://en.wikipedia.org/wiki/Walpurgis_Night