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I said I would research this and give you info, but I didn't find English resources, so much is it a Germanic lore. Briefly, the nights from Christmas Eve to January 6th are said to be magical, that knowledge of the future is possible then, that other wolrds are near, that spirits roam freely. Here I made a Google Translation of the German Wiki page about it. So it's in bad English of course now. But maybe you can make sense of it: Rauhnhte
In recent years these nights always had a weird quality to me. For practice: Just open up to it from Christmas Eve on, pay attention to what comes from the darkness. Go outside in the dark. It doesn't have to be the wilderness. The spirits like the bright places where people go about. If you have spirit contacts you might just recognize 'em on the street somewhere. The phase should usually wear off about January 6th. However it is said that some spirits tend to stay longer and have to be cast out with later exorcisms. So a little banishing around January 6th can be appropriate. I guess you'll mostly see the spirits who like you, so no problem. You don't need to forget the indulgence of the festivities however.