Describe the bug
Event Type,Event Topic,Event subtopic, License cannot be made null once set
To Reproduce
Steps to reproduce the behavior:
Expected behavior
There should be an option "none" which sets these fields to null.
Screenshots

Additional context
I'm working on it.
@harsh-jindal specifying a category of event is must so there is no need to make these fields null 馃槃
@kushthedude Event Type is not a required field.
working on it.
Please finalize #4942 first
Use of License of Event Data & Content on Wizard step 2 is still missing to finalize this issue.