CCalendarEvent::getEventForEditInterface

static function getEventForEditInterface($entryId, $params = [])
{
	$entry = self::GetList(
		[
			'arFilter' => [
				"ID" => $entryId,
				"DELETED" => "N",
				"FROM_LIMIT" => $params['eventDate'] ?? null,
				"TO_LIMIT" => $params['eventDate'] ?? null,
			],
			'parseRecursion' => true,
			'maxInstanceCount' => 1,
			'preciseLimits' => true,
			'fetchAttendees' => true,
			'checkPermissions' => true,
			'setDefaultLimit' => false
		]
	);

	if (!$entry || !is_array($entry[0]))
	{
		$entry = self::GetList(
			[
				'arFilter' => [
					"ID" => $entryId,
					"DELETED" => "N"
				],
				'parseRecursion' => true,
				'maxInstanceCount' => 1,
				'fetchAttendees' => true,
				'checkPermissions' => true,
				'setDefaultLimit' => false
			]
		);
	}

	// Here we can get events with wrong RRULE ('parseRecursion' => false)
	if (!$entry || !is_array($entry[0]))
	{
		$entry = self::GetList(
			[
				'arFilter' => [
					"ID" => $entryId,
					"DELETED" => "N"
				],
				'parseRecursion' => false,
				'fetchAttendees' => true,
				'checkPermissions' => true,
				'setDefaultLimit' => false
			]
		);
	}

	$entry = is_array($entry) ? $entry[0] : null;

	if (is_array($entry) && $entry['ID'] !== $entry['PARENT_ID'])
	{
		return self::getEventForEditInterface($entry['PARENT_ID'], $params);
	}

	return $entry;
}