Properties beforeproperties itemupdating
Requirements has come up to do more work on content approval/reject.
But unfortunately, Share Point list/library doesn’t have events like Content Approved, Content Rejected, Content Requested For Review so that user can tap the events to do their own work on content approval status changes.
Each event method has a SPItem Event Properties parameter named properties.
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Like the title says, If you are writing an event handler for document libraries / lists, properties.
If your list is already provisioned, you can change them with Server Object Model, why not in Power Shell: Technet: Setting Show In Display Form, Show In Edit Form, Show In New Form properties with powershell.
If you don’t have access to the server, then the same can be done with JSOM.