Tell me which task begins the point of no return (The Witcher 3: Wild Hunt)

after the passage of the plot. the game continues

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the point after which additional missions will come up some will be when you sail to the island of fogs for ciri
there they will write to you in plain text about it and there will be an option to press "no" so don't worry

there will be a warning in front of the Isle of Mists that SOME quests will be unavailable. such as quests by Lambert, Keira, etc., because

Spoilers after the island of fogs / kaer morhen no longer meet

other additional tasks that do not affect the storyline - will be available

To be more precise, there are 3 places (the plot has not yet passed), after the transition of which some squares are canceled:
1. after meeting the Redanian spy with Roche (meeting with Rodavid in Oxenfurt)
2. after the first trip to Kaer Morhen (when you pick up Umu)
3. Actually a trip to the Island of Mists
4. Well, the final square. or near it, hike (not yet reached).
This is if for absolutely all sq.

It looks like it should be reported. I haven't arrived yet

Tell me, are there any other quests (except Lambert's quest) that are canceled after Geralt takes Uma?