In vPlan it is possible to switch days on or off. When your company is closed for a day, for example due to a holiday or anniversary, you can easily turn this day off. It is therefore not possible to plan orders on this day and no capacity is shown on this day.
You can easily turn on the days by hovering your mouse on a date in vPlan. A switch will appear below the date, as shown in the image below. If you click this you can switch a day on or off.