If you need to update all active passes to expire on a certain date, head to Manage Passes and click the Actions Dropdown. Select Bulk Edit Active Pass End Date:
From this page, you will use the section Expire All Active Passes on a Specific Date. This will impact all active passes that already have an expiration date. This will not impact memberships. You will not be able to undo this action, so be sure you are confident in your date selection. Select the date and click Set Active Passes Expiration Date when you are ready.
Your customers will not be notified, but you may wish to send them an email about the change.
Punchpass adds an internal note on each pass that was adjusted: