EVENT_CATEGORY_LINK_MANAGE EVENT Endpoint
  /rpc/event/?method=EVENT_CATEGORY_LINK_MANAGE  
  Object: 232. Click here for more information.  
  Link an event to a Category.  
  PARAMETERS TYPE NOTES
  DataReturn Text A comma delimited list of advanced search fields to be returned after a successful save
  Id Numeric  
  Remove Numeric Pass '1' to remove the item
       
  Category Numeric  
  Event Numeric Mandatory. As per EVENT_MANAGE
  Notes Text (2000)  
  RETURN  
  notes ADDED, REMOVED