Hi. If my 30 days visa on arrival will finish this Saturday (may 13th) and I just find out the immigration office close tomorrow and no time to go today and I want to extend the visa in another 30 days , can I go on Monday to extend the visa? Or they won't let me?
TLDR : Answer Summary
You can extend your 30-day visa on arrival by visiting the immigration office on the next business day if your visa expires on a day when the office is closed. You may not incur an overstay fine, but it's possible to receive an overstay stamp with a note indicating that the fine is waived due to the closure.