public List <User> InviteFriends(int eventPageId, int[] invitedCustomerIds)
        {
            var invitedCustomers = new List <User>();

            foreach (var customerId in invitedCustomerIds)
            {
                var eventPageAttendance = new EventPageAttendance()
                {
                    CustomerId         = customerId,
                    EventPageId        = eventPageId,
                    AttendanceStatusId = (int)AttendanceStatus.Invited,
                };

                Repository.Insert(eventPageAttendance);

                var customer = _cutomerService.GetCustomerById(customerId);
                invitedCustomers.Add(customer);
                _messageService.SendEventInvitationNotification(customer, _workContext.WorkingLanguage.Id, 0);
            }

            return(invitedCustomers);
        }