CEventCalendar::CheckGuestsAccessibility

function CheckGuestsAccessibility($arParams)
{
	if (!isset($arParams['from']) || !is_array($arParams['arGuests']) || count($arParams['arGuests']) < 1)
		return false;

	$from = date(getDateFormat(), MakeTimeStamp($arParams['from'], getTSFormat()));
	$to = isset($arParams['to']) ? date(getDateFormat(), MakeTimeStamp($arParams['to'], getTSFormat())) : $from;

	$arGuests = array();
	foreach ($arParams['arGuests'] as $userId)
		$arGuests[$userId] = $userId;
	return $this->HandleUserSearch(false, $from, $to, $arGuests, $arParams['eventId']);
}