Raising an event using Action delegate

Program.cs

using System;

namespace create_implement_events_callbacks
{
    class Program
    {
        static void Main(string[] args)
        {
            var publisher = new Publisher();

            publisher.OnChange += () => Console.WriteLine("Merry Christmas!");
            publisher.OnChange += () => Console.WriteLine("Happy New Year");

            publisher.Raise();

            Console.ReadKey();
        }
    }

    public class Publisher
    {
        public Action OnChange { get; set; }

        public void Raise()
        {
            OnChange?.Invoke();
        }
    }
}