def METHOD_NAME(event, users):
    regs = []
    for user in users:
        reg = Registration.objects.get_or_create(event=event, user=user)[0]
        regs.append(reg)
    time = timezone.now() + timedelta(seconds=5)
    for reg in regs:
        async_register.apply_async((reg.id,), eta=time)
    input("Start the celery workers: DONE?")
    registrations = Registration.objects.filter(event=event).order_by(
        "registration_date"
    )
    first = registrations.first()
    last = registrations.last()
    diff = last.registration_date - first.registration_date
    print(f"Number of registrations: {registrations.count()}")
    print(f"Number pool1 {pool1.registrations.count()} / 100")
    print(f"Number pool2 {pool2.registrations.count()} / 10")
    print(
        f"Time per registration {diff.total_seconds() * 1000 / registrations.count()}"
    )
    print(f"Total time: {diff.total_seconds() * 1000}")