It's pretty tricky, especially with dice randomness being such a big part of it... I can think of several occasions when the DM has gone "I had this as a possibility but given the odds I did not think it would happen, welp" (like when the Aerois party got magically yeeted across space to another planet). And then there's player initiative too, like the dragon siblings in Strahd who have never yet been offered a dangerous deal they didn't take, lol (there is a reason their players have a joint gaming stream called Chaos Twins!). I tend to do more "missing moments" fic, or just accept that it will likely become an AU as canon progresses.

I'll email you once the assignments are out! Should be end of the month-ish :)