If you want to set a specific due date for an assignment, you can lock it from students adding notes and responses. Lock/unlock periods can be set for the entire class, or for individual students. Also, you can set specific unlock/lock times for a certain date. When an assignment is locked, students will be able to access the text but not add notes or responses.
Lock an Assignment
STEP 1: Select a class, and then click on the "Assignments" tab.
STEP 2: Click on the "LOCK/UNLOCK" drop-down, and select "Manage locking"
STEP 3: Select the assignment you'd like to lock
STEP 4: Set your lock period start date
STEP 5: Click "Lock"
This will Lock the assignment for the entire class
Verify Lock status
When an assignment is locked, a pink lock icon will appear on the assignment tile. Hovering over the icon displays the lock start date and the end date, if one is set.
Unlock a locked assignment
STEP 1: Click on the "LOCK/UNLOCK" button, and select "Manage unlocking" from the drop-down menu.
STEP 2: Select the text that you wish to unlock
STEP 4: Set your unlock period start date
STEP 5: Click "Set Unlock"
Lock assignments for individual students
After specifying a lock/unlock time, select “Individual students”
A list of the students in that class will appear. Select the students you would like the lock/unlock period to apply to, and click "Lock" (or "Unlock" if setting unlock periods).