30 June - Benedict Day, Mass, STAFF AND STUDENTS FINISH FOR TERM 2
1 July to 8 July - GSE Year 10 Immersion Santa Teresa, GSE Staff Immersion Philippines
2 July to 7 July - GSE Year 11 Ministry Outreach
17 July - Staff Return for Term 3
21 July - CSDA Debating Semi Final
24 July - STUDENTS RETURN FOR TERM 3, DIO Netball
25 July - College Assembly, Careers Market
26 July - Year 8 Italian Excursion, Year 11 SOR Excursion
27 July - MISA Debating, Year 12 Chemistry Excursion
28 July - Mater Dei Feast Day, Year 11 Hospitality/Business Services Excursion
31 July to 14 August - Year 12 Trial Examinations 
1 August - Middle School Parent Forum, ANCQ Chemistry Quiz, ICAS English Competition
3 - 4 August - Year 11 2018 Subject Selection Interviews
4 August - Year 9,10,11 AIME Excursion, CSDA Debating Grand Final
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
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
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
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
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