You can now set Blockout Dates under Scheduling → Settings, next to Lead Times. Add single days, date ranges, or weekly closed days, with an optional reason. Lead time is still checked first; blockouts apply after.
On public booking and gift booking, blocked delivery days look the same as lead-time days—they simply can't be picked. Same-day delivery is refused on a blocked day. Pickup dates stay open so you can negotiate after the rental, and custom quote requests are unaffected.
When you create or edit a reservation as an admin, you'll see a warning as soon as you pick a blocked delivery date; you can acknowledge and save anyway. Existing reservations on a newly blocked day get an admin-only badge—customers aren't notified or canceled. The schedule calendar also labels blocked days with the reason as a tooltip.