Term Three: 25 July - 30 September / Term Four: 17 October - 13 December
- Friday 9 September - Waikato Band and Orchestra Festival, all day
- Friday 9 September - Whaanau Dinner, 6.00 pm, Te Kura Piiihopa o Waikato Gym
- Sunday 11 September - Sonning and Waikato Diocesan School Old Girls' Association AGM, Selwyn Dining Room, 10.30 am. Parking at River Rd entrance.
- Sunday 11 September - House Service (Blake, Hillary, Ross), 7.00 pm, All Saints Chapel. Uniforms to be worn.
- Friday 16 to Thursday 22 September - Senior Derived Grade Exams
- Thursday 22 September, 6.00 pm, School Association fundraiser - Dio Demi Degustation. Buy tickets here.
- Thursday 22 September - EXEAT
- Friday 23 September - Teacher Only Day (marking and moderation)
- Saturday 24 September - Class of 89 Reunion
- Wednesday 28 September - Boards' meeting, 5.00 pm, CRC
- Thursday 29 September, Arts Showcase, 7.00 pm, Nancy Light Hall. Purchase tickets here.
- Thursday 29 and Friday 30 September - Waikato Culinary Fare, WINTEC
- Friday 30 September - End of Term 3.
- Sunday 2 October - School Association Dio Golf Day Fundraiser
Please refer to the online website calendar for the most up-to-date information.