| 2025-10-02 (Thu) | Yom Kippur (School Closed) [Columbia Secondary School] | 
                                                                                                                                                                                                                                                                                                                    
                                        | 2025-10-06 (Mon) | Staff Meeting ( HS/AM - MS/PM) [Columbia Secondary School] | 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
                                        | 2025-10-13 (Mon) | Indigenous Peoples' Day (School Closed) [Columbia Secondary School] | 
                                                                                                                                                                                                                                                        
                                        | 2025-10-16 (Thu) | CSS Hispanic Heritage Showcase [Columbia Secondary School] | 
                                                                                                                                
                                        | 2025-10-17 (Fri) | CSS Hispanic Heritage Showcase [Columbia Secondary School] | 
                                                                                                                                                                                                                                                        
                                        | 2025-10-20 (Mon) | Diwali (Schools Closed) [Columbia Secondary School] | 
                                                                                                                                
                                        | 2025-10-21 (Tue) | Spirit Week [Columbia Secondary School] | 
                                                                                                                                
                                        | 2025-10-22 (Wed) | Spirit Week [Columbia Secondary School] | 
                                                                                                                                
                                        | 2025-10-23 (Thu) | Spirit Week [Columbia Secondary School] | 
                                                                                                                                
                                        | 2025-10-24 (Fri) | Spirit Week [Columbia Secondary School] | 
                                                                                                                                                                                
                                                                                            | Homecoming (West Gym) [Columbia Secondary School]
                                                    
                                                                                                                     — 6:30 pm - 9:15 pm | 
                                                                                                                                                                                                                                                        
                                        | 2025-10-27 (Mon) | Staff Meeting (HS/AM - MS/PM) [Columbia Secondary School] | 
                                                                                                                                                                                                                                                        
                                        | 2025-10-30 (Thu) | MS Jazz @ Lincoln Center [Columbia Secondary School] |