Random broken events on the map.
I see it as a bug, but it seems it’s related to the current rift events (https://wiki.guildwars2.com/wiki/Class_I_Magic_Rift). The even marker seems to be used to point out where a rift can appear, then triggering an event there. Already reported in https://forum-en.gw2archive.eu/forum/support/bugs/Content-Guide-pointing-to-false-event-markers/
I’m still for it to be changed to something else (maybe use specific icons instead event markers) if it was intended to point those rift events. The way it is now disrupts game play when seeking truly for events and makes it frustrating to travel there and be like “whut?” glancing at an empty and quiet area when expecting to have an event there.
Those (Rift) events count toward Daily Map Events and toward Map Event Rewards. Grab a Stabilizer and rake in the rewards.