Matchpoint allows you to set up different prices for public holidays.
To set up new public holidays, go to Planning → Centers Configuration.
Access your centre clicking on the 'Edit' button.
Then click on 'Holidays' and then on 'New'. In the next window you can select the day, the month and the year you whish to mark as public holiday. You can choose that the same day is to be conosdered a public holiday every year.