I like the way we operate within our Adult and Graduate Studies program, specifically for our distance ed courses.
We give access in Canvas a week before classes start. However, that access is only to the course layout and the syllabus. We do not give access to course assignments, discussions, quizzes, etc, this way students cannot submit anything before the course even begins. This is just one of the procedures that gives us much confidence in knowing that we truly are acting as a Distance Ed program and not a Correspondence Program (see link below).
We are able to do this with the use of modules. We put all of our course content in modules, disable other course navigation functions like assignments, discussions, etc. and then lock down our modules to automatically open on the first day of the term. This allows students to get a feel for Canvas (important for first-timers) and then also have access to the syllabus to plan for upcoming assignments. Like @kona , we use a different vehicle for providing textbook information, which is available much earlier for student access.
Check out this link to see why knowing the difference between Distance Ed and Correspondence is important. 
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