Hello @Sarah803,
You can put individual prices on individula dates or a range of dates.
Go to your calendar and click on the first date whose price you want to change.
A window with a "Start date", "End date" and "Price" box will appear on the right.
Fill in the dates and the price and click on "Save changes".
You can also specify the date range by dragging on the little "III" at the edge of the date box until you've covered all the dates whose price you want to change.
To set the price for a single date just leave the start and end dates the same.
Steve.