On January 14th, Princess Nobuko attended the 2018 Kodokan Kagami Biraki (opening round rice cakes) Ceremony.
Photos:
2018 Kodokan Kagami Biraki Ceremony was held | Kodokan Judo Institute
On January 18th, Princess Akiko attended the opening ceremony of the Japanese Sword Museum in Sumida, Tokyo.
Photos:
seiyudo.com
More info at
The Japanese Sword Museum - English
Now for a bunch of old events, hopefully I've skipped events already covered in this thread: Princess Akiko attended a cultural workshop at Kogakkan University in Ise, Mie Prefecture on August 25, 2015.
Photos:
kogakkan-u.ac.jp
Princess Akiko visited Viu Manent Winery during her official visit to Chile in 2013.
Viu Manent Winery Facebook album
Another photo of Princess Nobuko at the JCI World Conference in Amsterdam in early November 2017.
Source:
fukuyamajc.com
http://www.fukuyamajc.com/2017/wp-content/uploads/2017/11/S_6963173657097.jpg
Princess Nobuko attended the memorial service at Chidorigafuchi National Cemetery on October 18, 2017.
Photo:
www.boen.or.jp
Princess Nobuko watched karate during the 2017 National Sports Festival in Ehime Prefecture in early October.
Photos:
karatedo.co.jp
On January 28, 2017, Princess Nobuko spoke at the 2nd day of the 5th NSCA (National Strength and Conditioning Association) International Conference. NSCA is headquartered in Colorado Springs, Colorado, USA. NSCA Japan was established in 1991.
Photo:
physiqueonline.jp
http://physiqueonline.jp/system/photos/images/000/007/471/medium/uploadimage.jpg
Princess Nobuko attended the 18th Prince Tomohito Cup Girls Gateball Competition in Tome, Miyagi Prefecture on September 30, 2016.
Photo:
tome.mypl.net
On March 5, 2016, Princess Nobuko attended the 20th anniversary commemorative forum for Women's Healthcare Awareness and Menopause Network Society held in Chiyoda, Tokyo. She is honorary president.
Photos:
meno-sg.com
https://meno-sg.com/20/images/report/154.png
https://meno-sg.com/20/images/report/410.png
On March 7, 2015, Princess Nobuko attended the FY2014 Women's Health and Work-Life Balance Awards ceremony, sponsored by NPO "Women's Healthcare Awareness and Menopause Network Society."
Photos:
pino-a.co.jp