Adding custom BaseEventData to UnityEngine.EventSystems NOT Unity.Events

as i understood from your comment you need something that can register events and use them

ill show you 2 examples try to play with them since i dont have the time

//first example

  using UnityEngine;
  using System.Collections;
  using System;
  using UnityEngine.Events;
  using UnityEngine.EventSystems;
  
  
  public class MyClickTrigger : MonoBehaviour , IPointerClickHandler
  {
      #region IPointerClickHandler implementation
  
      public void OnPointerClick (PointerEventData eventData)
      {
          MyOwnEventTriggered ();
      }
  
      #endregion
  
      //my event
      [Serializable]
      public class MyOwnEvent : UnityEvent { }
  
      [SerializeField]
      private MyOwnEvent myOwnEvent = new MyOwnEvent();
      public MyOwnEvent onMyOwnEvent { get { return myOwnEvent; } set { myOwnEvent = value; } }
  
      public void MyOwnEventTriggered()
      {
          onMyOwnEvent.Invoke();
      }
  
  }
  ///add a collider to the object as well so the OnPointerClick can work

//second example

create a script like this one

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI.Extensions;
 
 using UnityEngine.Events;
 
 
 
 public class MyEventManager : MonoBehaviour {
 
 
     private Dictionary<string,UnityEvent> eventDictionary;
     private static MyEventManager eventManager;
 
     public static MyEventManager instance
     {
         get
         {
             if (!eventManager)
             {
                 eventManager = FindObjectOfType (typeof (MyEventManager)) as MyEventManager;
 
                 if (!eventManager)
                 {
                     Debug.LogError ("There needs to be one active EventManger script on a GameObject in your scene.");
                 }
                 else
                 {
                     eventManager.Init (); 
                 }
             }
 
             return eventManager;
         }
     }
     void Init ()
     {
         if (eventDictionary == null)
         {
             eventDictionary = new Dictionary<string, UnityEvent>();
         }
     }
     public static void StartListening (string eventName, UnityAction listener)
     {
         UnityEvent thisEvent = null;
         if (instance.eventDictionary.TryGetValue (eventName, out thisEvent))
         {
             thisEvent.AddListener (listener);
         } 
         else
         {
             thisEvent = new UnityEvent ();
             thisEvent.AddListener (listener);
             instance.eventDictionary.Add (eventName, thisEvent);
         }
     }
 
     public static void StopListening (string eventName, UnityAction listener)
     {
         if (eventManager == null) return;
         UnityEvent thisEvent = null;
         if (instance.eventDictionary.TryGetValue (eventName, out thisEvent))
         {
             thisEvent.RemoveListener (listener);
         }
     }
 
     public static void TriggerEvent (string eventName)
     {
         UnityEvent thisEvent = null;
         if (instance.eventDictionary.TryGetValue (eventName, out thisEvent))
         {
             thisEvent.Invoke ();
         }
     }
 }

and then you register an event this way

 public class LastPageTriggers : MonoBehaviour {
 
     void OnEnable()
     {
         MyEventManager.StartListening ("lastPage",LastPage);
 
     }
     void OnDisable()
     {
         MyEventManager.StopListening ("lastPage", LastPage);
     }
     void LastPage()
     {
         Debug.Log ("Last Page function");
     }
     public static void TriggerLastPage()
     {
         MyEventManager.TriggerEvent ("lastPage");
     }
 }
 
 //do not forget to stop listening on disable
 //if you want to invoke the method LastPage from anywhere you just call //the static method of TriggerLastPage
 //so somewhere else you would have
 
     void Update () {
 
         if (Input.GetKeyDown ("u"))
         {
             MyEventManager.TriggerEvent ("lastPage");
 //or LastPageTriggers.TriggerLastPage();
         }
 
     }