You can setup different auto-confirm rules for a particular day or occasion within your booking type settings.
For example, Christmas Day lands on a Sunday this year, normally I am happy to auto-confirm bookings up to ten guests however for this day I only want to auto-confirm up to five people.
To set this up:
Click Settings, sites, and select your site.
Click Booking Types and select your relevant booking type.
Scroll down to Auto-confirm Rules and click ADD ANOTHER.
Choose between making a rule for Days or Date and select the Date.
Enter the relevant rules and click Save.