Ok I have solved this puzzle my self…. just its hard to find which file needs editing…
File name: tribe-view-helpers.class.php
code need to add
if ($englishMonth == $currentMonth || $nextMonth == $englishMonth ) {
$options .= "$monthText\n";
}
$monthIndex++;
Now just current and next month available to select by visitor to view events…. Cheers
thanks