Entering a multi-day event isn't that much different than entering a repeating event.
The key concept to keep in mind is that a multi-day event is just a regular event that repeats for a certain number of days.
Here are some examples, along with how they were configured in the Event Editor:
How it is displayed:
How it was configured on the Event Editor:
How it is displayed:
How it was configured on the Event Editor:
How it is displayed:
How it was configured on the Event Editor:
You can also have the multiple event boxes automatically combined by selecting a different calendar view style: |