[Castleview]

That won't make a difference. A soon as you edit either league to
change something, expansion, playoff format , number of games etc...
it will generate a new schedule and the inter-league Stanley Cup event stops working.

In the game I'm currently playing the 1917-18 season was ok. I then
expanded PCHA on 1st July 1918. The season was then changed to
run in October/November,(both leagues).and the Stanley Cup event was
scheduled for April 1919. However, when the April arrived it wasn't played.
That could be intentional as 1919 was the year it really wasn't played, but I doubt it.
There were no messages to explain why etc...

On 1st July 1919, the leagues were again scheduled starting in October 1919,
but the Stanley Cup event was scheduled in December 1920 (the following season). This pattern has continued each season,
1st July Year X, Stanley Cup December Year X+1, so it's like chasing a rainbow,
by the time you get there it's moved somewhere else! I suspect if you did manage to catch
it, it wouldn't take place anyway.