You can customize the calendar in many ways. For example different event-color is shown [here](https://fullcalendar.io/docs/event-colors-demo). Check the source code.

**Scenarios - UNKNOWN SCENARIO EXCEPTION**
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I have been using scenarios a lot but today I spent 1 hour on a problem - I had 2 scenarios and one of them was just assigned to the model ...

 
```php $model->scenario = "abc"; ```
 
... but had no **rule** defined yet. I wanted to implement the rule later, but I didnt know that when you set a scenario to your model it **must** be used in method rules() or defined in method scenarios(). So take this into consideration. I expected that when the scenario has no rules it will just be skipped or deleted.