Fallen star
Explorer
I ran the campaign from 2019-21. Before I ran I read the entire thing and took notes.
This helped me a lot. I knew that divination magic would come into play, so knowing in advance allowed me to predetermine what info or clues could be safely given. It also let me know when I could alter details without conflicting with later parts of the adventure.
Remember that a mystery has to unravel on stages. For example, they go from not knowing there is a conspiracy, to vaguely knowing, to learning things they are doing (like the lanterns) to knowing who is involved. The party doesn't learn the Obs goals until much later.
So at any point in the campaign I know to only reveal info based on what they should know.
This helped me a lot. I knew that divination magic would come into play, so knowing in advance allowed me to predetermine what info or clues could be safely given. It also let me know when I could alter details without conflicting with later parts of the adventure.
Remember that a mystery has to unravel on stages. For example, they go from not knowing there is a conspiracy, to vaguely knowing, to learning things they are doing (like the lanterns) to knowing who is involved. The party doesn't learn the Obs goals until much later.
So at any point in the campaign I know to only reveal info based on what they should know.