You can add a Multiplier to your prices in the Calendar to increase or lower all prices on a certain day or date range.
To add a price multiplier to certain days or a longer period please visit your calendar view and press the date which you want to start with.
In the pop up window , please add the multiplier and the end date.
110% price multiplier adds 10% to the price.
90% price multiplier lowers the price by 10%.