Anything that happens specifically on Gehimnisnacht is dangerous.
And going out under Morrslieb's light can lead to mutation.
I say thee NAY!
All magical things are more likely to happen when the Chaos moon is in the sky, the Colleges of magic have rites then, dangerous ones yes, but they do. It is worth keeping in mind what the Dark Moon is called in the Empire Morrslieb, Beloved of Morr. Since Prehistorical times the tribes have known that it is under its light that the dead, all of the dead come to speak, it is not just about Chaos.