If you want to book an event that covers multiple days, there are a couple of ways you can do this:
Date only:
One way is to create a package for a date only.
Go to Manage -> Packages.
Click Add a Package.
Click Save.
Select your new package and click the Pricing & Scheduling tab.
Select Date Only and enter the number of days you want the package to include.
Click Save.
When you create a proposal that includes this package, you can add as many extra days as your availability allows, or add the package more than once.
Other methods
Multiple packages:
Alternatively, you could create a package for a number of hours and add the package to the booking multiple times, changing the date each time.
Custom or One-off package:
If you are creating a proposal or entering a booking that has already been confirmed, you can create a one-off package, then add it again for the subsequent day(s).