/**
 * Selected active event for given date.
 *
 * @param  Carbon $date
 * @return Event
 */
public static function active(Carbon $date): Event
{
    return self::where('locked_active', true)->count() > 0
        ? self::where('locked_active', true)->firstOrFail()
        : self::where('date', $date)->firstOrFail();
}