Ok usually I can answer just about any question.....but this one is way to vague and covers a city that has tons on content in it. It is almost impossible for me to figure out what spawn you are referring to without more info.
Are you talking about the Dynamis spawn, your Adventuring Fellow meeting spot or that ??? outside Upper Jeuno in Batallia Downs that even after 10 years of playing, I don't known what they are for. These are just a few spawn or triggers in Jeuno.