National Underground America Day has always been observed annually on May 14.
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When is National Underground America Day?
- National Underground America Day 2017 is observed on Sunday, May 14, 2017
- National Underground America Day 2018 is observed on Monday, May 14, 2018
- National Underground America Day 2019 is observed on Tuesday, May 14, 2019
- National Underground America Day 2020 is observed on Thursday, May 14, 2020
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