At some point in late March or early April, IIRC, there's radio message about British task forces leaving Britain and believed to be heading east to prepare for invasion/defense of Norway. That's the first indication I remember that things up there are about to get interesting.
Once German operations in Norway are underway (or close to it), you start getting messages about proceeding to defend Narvik or Trondheim or whatever. You can consider them merely "immersive" or obey the "orders" and put yourself into the middle of things.
I think at some point there's another message that releases u-boats back to their previously assigned patrols.
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