Canon ends where the table starts

There is a massive canon of work to support a GM using the Forgotten Realms setting. The minute play starts (even before the players enter the game) it becomes my world and what I say goes. I am god(s) and I have the ultimate authority.

What brought this thought to mind is that I finally started play in my PBP game last night and created about 150 civilians, several named individuals and several locations within ‘my Waterdeep’ that exist in no other.