public async Task <ActionResult <IEnumerable <AttendeeRegistrationResponseDto> > > GetAllAttendees()
        {
            var allItems = await attendeeRepository.GetAllAsync();

            if (allItems == null)
            {
                return(StatusCode(StatusCodes.Status404NotFound, "No Attendees Found"));
            }
            return(StatusCode(StatusCodes.Status200OK, allItems.Select(item => item.AsResponseDto())));
        }