I put in a support case for World Events not working. I cannot complete them and was told to watch the Forums for updates, but did not see any reports of the current issue. I've tried searching for the specific events and found nothing.
There was reports of problems from November 2020 but supposedly they were fixed.
Everything was working up to February 27, 2021, when I last made a Manual Save. Even losing 3 days progress and loading my last Manual Save did not fix the problem.
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Support had me make a video showing the problems. I used OBS (was in rush to get problems solved so did not read any instructions) but the video is really dark and only covers a little more than 1/4 of my actual screen. It can be viewed on YouTube by searching for "Assassin's Creed Valhalla World Event are glitched 3/3/21".