A Twitter conversation between the Xbox Sweden and Bethesda Nordic profiles sparked a spark of concern, although it may be too early to be alarmed...but let's recap what exactly took place.
Bethesda Nordic, a Twitter profile, has sent a message to Xbox Sweden asking if there was any interest in the April 21 event. Why do we not know anything about it, then? Simply because, to date, at least officially, there is no Xbox event scheduled for this date.
Is this the date of the Starfield presentation event? Probably not, but we can't rule it out. However, the fact that this message isn't found anywhere else on the other profiles of the two companies suggests a local event, or perhaps simply the exchange of tweets occurred (by accident?) prior to time when compared to the other Xbox divisions, and the message in question is the likely date of the starfield event.
According to rumors, the launch of Starfield will take place in March, and therefore it isn't clear what Xbox will be scheduled until the end of April, the most probable assumption is that it may be, as mentioned, a local or regional event for North Europe, we will know more in the coming weeks.