- June/2024 Submitted to the 77th Women Artist Association Exhibition
- April/2024 Contemporary Japanese Art (Supervised by Bijutsu no Mado) Vol.31
- April/2024 Recommended as a committee member of the Japan Watercolor Federation Exhibition
- April/2024 Submitted to the 83th Japan Watercolor Federation Exhibition
- October/2023 Exhibited at the 90th Dokuritsu Exhibition
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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.
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February/2023 Small Exhibition (Gallery Planning) at Ginza Gallichène
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November/2022 Hanasaiten Exhibition (group exhibition) at Galerie Shimon
- October/2022 Exhibited at the 89th Dokuritsu Exhibition
- June/2022 Submitted to the 75th Women Artist Association Memorial Exhibition
- April/2022 Submitted to the 81st Japan Watercolor Federation Exhibition
- April/2022 Contemporary Japanese Art (Supervised by Bijutsu no Mado) Vol.29
- October/2021 Exhibited at the 88th Dokuritsu Exhibition
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July/2021 Katsuko Sakai Watercolor Exhibition (Solo Exhibition) at Ginza Gallichène
- June/2021 Submitted to the 74th Women Artist Association Exhibition
- April/2021 Submitted to the 80th Japan Watercolor Federation Exhibition
- September/2019 Traveled to Spain for coverage
- June/2019 Travel to Yosemite National Park, USA
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July/2018 Katsuko Sakai Watercolor Exhibition (Solo Exhibition) at Ginza Galleria Graphica
- July/2016 Katsuko Sakai Watercolor Exhibition (Solo Exhibition) at Ginza Galleria Graphica
