National Holiday 海の日
![](https://groups.oist.jp/sites/default/files/styles/group_image/public/eventimg/2311/oist-logo_big-shisa_little-oist_14.png?itok=ztsFQldw)
Date
Monday, July 21, 2025 (All day)
Description
National holiday
All-OIST Category:
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National holiday
Subscribe to the OIST Calendar: Right-click to download, then open in your calendar application.