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- October/2022 Exhibited at the 89th Dokuritsu Exhibition
- April/2022 Submitted to the 81th Japan Watercolor Federation Exhibition
- October/2021 Exhibited at the 88th Dokuritsu Exhibition
- June/2021 Submitted to the 74th Women Artist Association Exhibition
- September/2019 Traveled to Spain for coverage
- July/2018 Katsuko Sakai Watercolor Exhibition (Solo Exhibition) at Ginza Galleria Graphica
- April/2024 Submitted to the 83th Japan Watercolor Federation Exhibition
- October/2023 Exhibited at the 90th Dokuritsu Exhibition
- July/2023 Katsuko Sakai Watercolor Exhibition (Solo Exhibition) at Ginza Gallichène
- June/2023 Recommended as a committee member of the Women Artist Association
- June/2023 Submitted to the 76th Women Artist Association Exhibition
- April/2023 Submitted to the 82th Japan Watercolor Federation Exhibition
- April/2023 Contemporary Japanese Art (Supervised by Bijutsu no Mado) Vol.30
- March/2023 The site has been renewed.
- February/2023 Small Exhibition (Gallery Planning) at Ginza Gallichène
