When I look at the map, I see this marker in Ked Bardu, in the upper-left corner of the town. It looks like some kind of tent and it has what looks like a little purple asterisk on its upper-right corner.
As I recall, this icon (or something like it) was often what appeared during the “special events”, like the Lunar Shrine event, when you had accumulated enough… stuff to get a reward.
Only now, when I go to Ked Bardu the marker disappears from the city. And when I go to the part of the city where it was showing, there is nothing there.