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Wait for 3 seconds: then the Calendar-instance will be rendered. However, the plugin is plugged in directly using plugAfterRenderPromise().
This example uses a plugin that is made especially for Calendar-instances and modifies the background-color of one of the Calendar's nodes.
If the plugin were to be plugged in at once, using:
```
new Y.Calendar().plug(Y.Plugin.OwnPlugin);
```
then an error would rise, because the variable headerlabel would be null. We have to wait until the Calendar is rendered.