If you have a stamp that expires on a day the immigration office is closed (weekends or holidays) and you go the very next day they're open you can get your extension like normal and will not be fined for overstay (you will get an overstay stamp in your passport but it will say "fine waived holiday")
Borders do not close for these holidays
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TLDR : Answer Summary
All immigration offices in Thailand will be closed on May 5th, May 9th, and May 12th. If your visa stamp expires on one of these closure days, you can go to the immigration office the next day it reopens without incurring a fine for overstaying; you'll receive an overstay stamp indicating that the fine is waived due to the holiday. Additionally, borders will remain open during these holidays.