SF_10.1, SF_10.2 - https://docs.sitefinity.com/for-developers-pages-events

IPagePreRenderCompleteEvent_Global.asax.cs

using System;
using Telerik.Sitefinity.Services;
using Telerik.Sitefinity.Web.Events;

namespace SitefinityWebApp
{
    public class Global : System.Web.HttpApplication
    {

        protected void Application_Start(object sender, EventArgs e)
        {
            SystemManager.ApplicationStart += new EventHandler<EventArgs>(ApplicationStartHandler);
        }

        private void ApplicationStartHandler(object sender, EventArgs e)
        {
            EventHub.Subscribe<IPagePreRenderCompleteEvent>(this.OnPagePreRenderCompleteEventHandler);
        }

        private void OnPagePreRenderCompleteEventHandler(IPagePreRenderCompleteEvent evt)
        {
            var page = evt.Page;
            var pageNode = evt.PageSiteNode;
        }

    }
}