public function getMainContactField($forcedropdown = false) {
		$attendees = $this->contactableAttendees();
		// Use a hidden field if there is only one attendee
		if ($attendees->count() === 1 && !$forcedropdown) {
			return HiddenField::create("RegistrantAttendeeID")->setValue(
				$attendees->first()->ID
			);
		}
		$source = $attendees->map()->toArray();
		$source[0] = _t("EventRegistration.NOTLISTED", "Not listed");
		return DropdownField::create("RegistrantAttendeeID",
			_t("EventRegistration.MAINCONTACT", "Main Contact"),
			$source
		);
	}