- NO SCHOOL: Election Day – November 4th, 2025
- Q1 ENDS: Grades close November 6th, 2025
- 6TH ANNUAL LIP SYNC BATTLE: November 6th, 2025
- HOMECOMING PEP RALLY: Modified Schedule – November 7th, 2025
- FOOTBALL GAME: Derby Vs. St. Paul senior night- November 7th, 2025
- HOMECOMING DANCE: Night in Paris – November 8th, 2025
- NO SCHOOL: Veterans Day – November 11th, 2025
- Q1 REPORT CARD CONFERENCE: November 13th, 2025
- Q1 REPORT CARDS ISSUED: November 14th,2025
- FOOTBALL GAME: Derby Vs. Ansonia- November 14th, 2025
- UNIFIED SPORTS: Half-time flag football game – November 14th, 2025
- MODIFIED SCHEDULE: Rachel’s Challenge school assembly – November 18th, 2025
- POWDERPUFF: Girls flag football game – November 21st
- EARLY DISMISSEL: Thanksgiving pep rally- November 26th, 2025
- FOOTBALL GAME: Derby Vs. Oxford – November 27th, 2025 at Oxford High School
- NO SCHOOL: Happy Thanksgiving Break- November 27th-28th
- Q4 REPORT CARDS ISSUED: Tentative Last Day- June 16th, 2025
- TRACK: New England Championships- June 14th, 2025 at 10:00 am at Willow Brook Park
- DHS CLASS OF 2025 GRADUATION- June 13th, 2025
- GRADUATION REHEARSAL 3- June 13th, 2025
- GRADUATION REHEARSAL 2- June 12th, 2025
- GRADUATION REHEARSAL 1- June 11th, 2025
- SENIOR EXAMS- June 10th, 2025
- SENIOR EXAMS- June 9th, 2025
- TRACK: State Open Championships- June 7th, 2025 at 11:00 am at Willow Brooks Park
- SENIOR CLASS TRIP: Lake Compounce- June 6th, 2025
- SENIOR EXAMS- June 4th, 2025
- TRACK: State Championships- June 2nd, 2025 at 10:00 am at Willow Brook Park
- NHS BINGO NIGHT SERVICE PROJECT- May 28th, 2025
- BASEBALL GAME: Home VS. Wilby- May 28th, 2025 at 5:30
- BASEBALL GAME: Home vs. Crosby- May 27th, 2025 at 5:30
- NO SCHOOL: Memorial Day- May 26th, 2025
- TRACK: NVL championship at Woodland- May 24th, 2025 at 9:00 am
- SOFTBALL GAME: Home VS. Kennedy- May 23rd, 2025 at 5:30
- DHS ACADEMIC AWARDS NIGHT- May 22nd, 2025
- SOFTBALL GAME: Home VS. Harding senior night- May 21st, 2025 at 5:30
- DHS SPRING CONCERT- May 20th, 2025
- SOFTBALL GAME: Away at Crosby- May 20th, 2025 at 3:45
- BASEBALL GAME: Away at Platt tech- May 19th, 2025 at 3:45
- VOLLEYBALL CARWASH FUNDRAISER- May 17th, 2025
- SOFTBALL GAME: Pink game home VS. Ansonia- May 17th, 2025 at 2:00
- BASEBALL GAME: Home VS. Ansonia- May 16th, 2025 at 5:30
- AP PSYCHOLOGY EXAM- May 16th, 2025
- BASEBALL GAME: Home VS. Gilbert- May 15th, 2025 at 5:30
- SOFTBALL GAME: Away at Ansonia- May 15th, 2025 at 3:30
- AP SPANISH LANGUAGE & CULTURE EXAM- May 15th, 2025
- AP COMPUTER SCIENCE PRINCIPLES EXAM- May 15th, 2025
- AP LANGUAGE AND COMPOSITION EXAM- May 14th, 2025
- SOFTBALL GAME: Home VS. Wilby- May 14th, 2025 at 5:30
- AP ENVIRONMENTAL SCIENCE EXAM- May 13th, 2025
- SOFTBALL GAME: Home VS. Oxford- May 13th, 2025 at 5:30
- AP CALCULUS EXAM- May 12th, 2025
- BASEBALL GAME: Home VS. St. Paul- May 12th, 2025 at 5:30
- Q2 Report Cards Issued- February 7th, 2025
- Early Dismissal: Modified School Schedule- February 12th, 2025
- DHS Report Card Conferences: Schedule Today!- February 12th, 2o25
- Early Dismissal: Modified School Schedule- February 14th, 2025
- Albarella Banquet: Congrats Boys!- February 16th,2025
- No School: President’s Day!- February 17th, 2025
- No School: February Break!- February 18th, 2025
- DHS McTeacher Night- February 24, 2025
- Q3 Progress Reports Issued- February 28th, 2025
- Early Dismissal: Modified Schedule- March 5th, 2025
- CASC Annual Spring Convention- March 7th, 2025
- Musical: High School Musical- March 7th & 8th, 2025
- Early Dismissal- Modified Schedule- March 13th, 2025
- SAT & PSAT: Study up!- March 13th, 2025
- PTO Fundraiser (A Night of Laughter): Comedy Show- March 15th, 2025
- Rock Your Socks Day for Down Syndrome- March 21st, 2025
- McBaseball Night- March 26th, 2025
- Senior Night Tickets on Sale- March 17th-28th, 2025
- Varsity Girls Basketball vs. O’Brien Tech: Good luck girls!- December 23rd, 2024
- No School: Winter Break- December 23rd, 2024- January 2nd, 2025
- Classes Resume: Welcome back!- January 2nd, 2025
- Varsity Boys Basketball vs. St. Paul Catholic: Good luck boys!- January 3rd, 2025
- Varsity Boys Basketball vs. Naugatuck: Good luck boys!- January 6th, 2025
- Varsity Boys Basketball vs. Wolcott: Good luck boys!- January 7th, 2025
- Varsity Wrestling vs. Nonnewaug: Good luck- January 8th, 2025
- Varsity Girls Basketball vs. Torrington: Good luck girls!- January 9th, 2025
- Varsity Boys Basketball vs. Ansonia: Good luck boys!- January 14th, 2025
- Varsity Girls Basketball vs. Crosby: Good luck girls!- January 15th, 2025
- No School: Martin Luther King, Jr Day- January 20th, 2025
- Midterm Exams: Study!- January 21st- January 24, 2025
- Midterm Exam Makeups: January 27th, 2025
- Varsity Girls Basketball vs. Watertown: Good luck girls!- January 27th, 2025
- Varsity Boys Basketball vs. WCA: Good luck boys!- January 28th, 2025
- Q2 Ends: Grades Close- January 28th, 2025
- Varsity Girls Basketball vs. Kennedy: Good luck girls!- January 29th, 2025
- Q3 and S2 Classes Begin: Check for any schedule changes- January 29th, 2025
- Varsity Wrestling vs. Northwestern: Good luck!- January 30th, 2025
- Varsity Girls Basketball vs. Woodland: Good luck girls!- January 31st, 2025
- DERBY VS. NORTH BRANFORD @ EAST HAVEN HIGH SCHOOL: First Round Of Volleyball States- November 4th, 2024
- UNIFIED SPORTS FLAG FOOTBALL TOURNAMENT: November 4th, 2024
- NO SCHOOL/ELECTION DAY: November 5th, 2024
- 7TH ANNUAL LIP SYNC BATTLE: Sync Your Hearts Out- November 7th, 2024
- Q1 ENDS: Grades Close- November 7th, 2024
- DERBY VS. WCA @ HOME: Football, Cheer, and Band Senior Night & Game- November 8th, 2024
- VETERANS DAY: No School- November 11th, 2024
- SCHOOL PICTURE RETAKE DAY: Smile!- November 12th, 2024
- DHS CONFERENCES: By Appointment- November 14th, 2024
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