Open means the centre’s booking page shows the date as bookable. Where the centre publishes a seat count, you’ll see how many are left.
Not open yet means the date is listed but booking hasn’t started. Where the centre announces the opening time, it’s shown in the centre’s local time, and you can add it to your calendar.
Full dates stay on the list because cancelled seats do come back. A free alert from French Exam Alert tells you the moment that happens.
TCF Canada needs all four tests for immigration and for citizenship. If you only need citizenship, compare TEF Canada dates too: TEF Canada for citizenship needs only listening and speaking.