If you would like to observe specific holidays during the close period, you can add them in Manage Entities under the Holiday Calendar section.
If the holiday falls on a business day deadline, the Checklist item or Reconciliation will become due the day after the holiday.
If the holiday falls on a hard deadline, the Checklist item or Reconciliation will become due the day before the holiday.
For Checklist tasks with a Weekly Frequency, the task will become due before the holiday as well.
After making any calendar setting changes, you will need to save changes from the Checklist and Reconciliation settings in order for due dates to be calculated with respect to these settings in any previously created periods.