Get data on getCreateEventFormSchema fullcalendar

Is there a way to get some data on getCreateEventFormSchema? I want to filter the machines I show according to the room. I need to get the room ID. Cant use $this on static method.

https://gist.github.com/haritz95/a5f2883cfd54f1a16731ecd393415a2e

Thanks

Gist

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