水工研同窓会 Published on 25th April 202327th February 2026 by yasuda-t Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: 11th August 2023 all-day Asia/Tokyo Timezone 2023-08-11T00:00:00+09:00 2023-08-12T00:00:00+09:00