The Glade Summit is the annual meeting, or earlier under special circumstances, of all the Nature Protectorates. At this week long summit, they discuss their regions, threats to the balance, and other matters of druidic interest.
The location and timing of this meeting is secret. The content and discussions of these meetings are recorded. An attempt is made to keep them secret, but fragments of information get out. A loose lipped Protectorate, perhaps after having too much spirit juice, may gossip about something at a Glade Summit. Sometimes, journals are lost, or stolen by mischievous sprites or other fey.
Since the founding of the Nature Protectorates, these bits of information have been collected and recorded in historical texts.