Add an interface in business service

using BusinessEntities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessServices
{
   public interface IEventService
    {
       Event GetEventById(int Event_ID);
       IEnumerable<Event> GetAllEvent();
       Event CreateEvent(Event EventEntity);
       Event UpdateEvent(int Event_ID, Event EventEntity);
       bool DeleteEvent(int Event_ID);
    }
}