You can schedule when a certain page is active. This means that when the page activity is scheduled, participants can interact with the page only between the scheduled times.
Go to the page you'd like to schedule the active time for
Open the page menu and choose 'Page settings'
Open the "Scheduling" section
Choose the option Schedule when page is active (not in read-only mode)
Choose the time frame during which participants can contribute - other times, the page will be in read-only mode (participants can access the page but cannot comment, answer to polls, etc., before or after the chosen dates)
Save settings
Administrators can edit the page settings at any time.