I called the government hotline 1111 and confirmed these were the holidays for immigrations this coming month.
CHECK with your immigration office about the 10th being a holiday or not.
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TLDR : Answer Summary
This post informs members about the immigration office closures in Thailand for May 2021, specifically on the 4th, 10th, and 26th. The user confirmed these holidays through the government hotline, but there is some confusion about whether May 10th is a holiday. The conversation includes various comments discussing the validity of these dates and links to official immigration websites for clarification.
There seems to be some confusion on whether the 10th is actually a holiday or not. It's listed on the Chiang Mai immigration office website (says "regional") BUT it is not listed on the holidays of Bangkok Immigration's website