Here's some steps you can take:
Turn off the Course Summary in the Syllabus. Look for the little box and uncheck it.
Disable most items into the students' Course Navigation Bar. Keep Modules, but disable Pages, Assignments, Discussions, Quizzes, and Files. That will encourage your students to access their course content through the Modules. (Go into Settings and then Navigation to do this.)
Unpublish all of the Modules. Just publish one Module at a time, and move the most recent one to the top.
Keep all of the Assignments, Discussions, and Quizzes unpublished until it's time for the students to work on them. (This will keep them from appearing on the students' Calendar.)
Once the students have submitted work, you can't "unpublish" those Assignments, Discussions, and Quizzes.
I hope this helps.
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