No, events have to already exist. What's happening is that an event that previously existed but has since been removed is being referenced--which, it's absolutely not surprising in the slightest that there's a glitch like this on this map. You should see what went into figuring out how to build this system, all because I decided to make a game that was basically plugging the TTRPG I'm developing--but I can't find anything referencing it. Also, I haven't been able to recreate the glitch myself. If I could just see exactly what's happening, I think I could figure it out.