Event definition in the class:

public class MyJobStep: ClientJobStepBase
{
   public event EntityObjectHandler OnEntityObject;
[...]
}

Call using only the instance:

public class MyJobStep: ClientJobStepBase
{
[...]
       DataInstance createdData = null;
[...]
       Job.Delegate(OnEntityObject, new EntityObjectArgs(createdData));
[...]
}

If possible, also pass the IDocument and (args.Document) the IMapObjectDocument (args.DocObject).

public class MyJobStep: ClientJobStepBase
{
[...]
       DataInstance createdData = null;
[...]
       Job.Delegate(OnEntityObject, new EntityObjectArgs(args.Document, args.DocObject, createdData));
[...]
}