- July 14, 2021 Foster City Entering Sister City Relationship with Inagi City, Japan
- July 26, 2021 Sister City Signing Ceremony
- July 27, 2021 Foster City Sister City Signing Ceremony with Inagi City, Japan
- July 28, 2021 Foster City adds sister city in Japan
- October 26, 2021 Happy 50th Anniversary to Inagi City from City of Foster City