On Succot, the world is judged for the coming year's Water Supply: Rosh HaShanah 16a; Taanit 2a
This judgment is the cause for the Succot Service of Water Libation: Rosh HaShanah 16a
When the judgment is sealed: Rosh HaShanah 16a
How the effect of this judgment could be altered, for better or worse, after its sealing: Rosh HaShanah 17b
