31 July - 14 August - HSC Trial Examinations
4 August - Year 9,10,11 AIME Excursion
8 August - Senior School Parent Forum
9 August - Year 9 English Incursion
10 to 11 August - Year 11 Leaders Camp
11 August - Year 11 Dinner Dance at St Gregory's College, Year 5 & 6 STEM Challenge
12 August - Year 12 Japanese Continuers Excursion
14 -18 August - Science Week
15 August - CCC Netball Championships
16 August - Year 9 2018 Information Evening, MISA Debating
18 August - Dio Athletics Carnival
21 August - DIO CCC Football
22 August - Sports Assembly (Guest Speaker Emma Swanson)
23 August - DIO Hockey & Volleyball (Opens)
24 August - College Group Photo Day
25 August - Year 9 Reflection Day, Senior School Dance
28 August to 1 September - Literacy and Numeracy Week
30 August - HSC Projects Showcase, Aboriginal Parent Forum, Year 10 Geography Excursion
31 August - MISA Debating
1 September - Father & Daughter Dinner Dance, Years 9, 10, 12 AIME Excursion
8 September - College Assembly, Middle School Dance (St Gregory's College)
9 September - Polynite Performance
13 September - NSW Oztag State Championships
15 September - NSW CCC Athletics
19 September - Year 12 Assembly, Year 12 Graduation Dinner
20 September - Year 12 Graduation Mass and Awards, Years 7 & 8 AIME Excursion
21 September - Year 12 Formal
22 September - STAFF AND STUDENTS FINISH FOR TERM 3
23 September to 2 October - Year 11 Philippines Immersion
9 October - STAFF AND STUDENTS RETURN FOR TERM 4