Events in Path of Terraria sometimes have a different set of criteria and ways that they spawn and those will be explicitly called out here.
The Goblin Army Event is changed in Path of Terraria.
Information on it here https://wiki.pathofterraria.com/en/Events/GoblinArmy
Does not spawn naturally. This is to ensure the King Slime Domain map is required to progress.
The Lunar Pillar event takes place inside of the Lunatic Cultist's Domain map.