| August 7, 2023 |
Flag Raising Ceremony |
All Campus |
| September 8, 2023 |
Grand Pep Rally 2023 |
Juan Sumulong Campus |
| September 18, 2023 |
Chiefs' Organization Oath-Taking Ceremony |
Juan Sumulong Campus |
| October 16, 2023 |
Founder's Day |
Elisa Esguerra Campus |
| October 27, 2023 |
AU Idol (Interbranch Competition) |
Jose Abad Santos Campus |
| November 2023 |
Chiefs Leadership Convention 2023 |
Plaridel Campus |
| November 2023 |
AU Showdown |
Jose Rizal Campus |
| December 30, 2023 |
Rizal Day |
Apolinario Mabini Campus |
| January 22-26, 2024 |
Intramurals (High School) |
Juan Sumulong Campus |
| February 5-16, 2024 |
Intramurals (College) |
Juan Sumulong Campus |
| February 19-23, 2024 |
University Week #OneArellanoConcert |
All Campus |
| February 23, 2024 |
Mr. and Ms. Arellano University 2024 |
Juan Sumulong Campus |
| April 2024 |
1st CAN (Chiefs Awards Night) |
Juan Sumulong Campus |
| May 2024 |
Chiefs Organizations' Election 2024 |
All Campus |