These companies have a person specifically hired whose job it is to handle these matters. A communications professional who understands that this type of withholding is a message in itself. A notice for an annual general meeting can be written at any time if the content is basic. Now it’s not - that’s obvious. It’s coming exceptionally late (a couple of weeks late compared to normal practice) and there’s something big and positive on the agenda because we’re going to a bigger venue to show off. Normal matters could have been handled in Oulu as well.
In the unlikely event that nothing new comes to light now, then I definitely predict an extraordinary meeting later. There might be something in the background that they don’t manage to get ready for this one.