Ceremonies & Traditions
30 items to include, container recommendations, burial vs storage guidance, the legal and permission steps, the sealing ceremony format, the interim management, and the opening ceremony script for 10 or 25 years from now.
A class reunion time capsule is one of the few activities that pays dividends twice: once at the sealing — which is moving and ceremonial — and again at the opening, which is genuinely revelatory. Letters that classmates wrote to their future selves in their early 30s land very differently when those classmates are in their 40s. Predictions about the world from 2015 read like a sci-fi document in 2025. Photos of children who are now in college. Prices that seem impossibly low.
The bar to clear is logistical, not creative: pick a container that will survive, document where it is, and set up a system to remember to open it. Most failed time capsules don't fail because of bad contents — they fail because someone loses the map, the buried spot gets paved over, or the storing alum moves and forgets they had it. The instructions below are designed to avoid those failure modes.
For a 10-year window, almost anything will work — most contributors will still be alive and engaged for the opening. For 25 years, you need to be more deliberate: archival paper, stable container, durable storage, and a system that survives the loss of any single person.
The contents that generate the strongest reactions at opening — based on what time capsule ceremonies consistently produce the loudest applause and the most tissues.
A letter from each classmate to their future self
The single most-anticipated item at every opening
Printed senior class photo with everyone labeled
Crucial for identification decades later
A copy of the yearbook (one full unsigned copy plus signatures pages)
Use acid-free archival sleeves
A copy of the local newspaper from reunion day
Front page, weather, sports, comics
A printed list of #1 songs, top movies, and top TV shows of the year
Most fun item to read aloud at opening
A current-year coin from the US mint (or your country's mint)
Stable, dateable, lasts forever
A pricing snapshot: gas, stamps, coffee, movie ticket, average home price
Generates the loudest reactions at opening
A printed cover of the most popular magazine that month
People, Time, Sports Illustrated
A class prediction sheet — everyone predicts what the world will look like in 10 or 25 years
Hilarious to revisit
Letters from teachers and administrators who taught the class
Often the most touching items at the opening
A printed family update card from each attending classmate
Family photo, kids' names, current city
Senior superlative results — printed and signed
Who was voted what, with current commentary
A flash drive with photos from the reunion night
Won't survive 25 years; combine with printed photo book as backup
A printed photo book of reunion night highlights
Print on archival paper for long-term survival
A list of every classmate currently in attendance with signatures
Like a yearbook signature page, but reunion-specific
A tribute page for classmates who have passed
Names, brief tributes, life dates
A current high school yearbook from the present graduating class
Lets future openers compare eras
A printout of the school's current website front page
Schools evolve more than people realize
A handwritten note from the principal or alumni director
Bridges current school to the alumni community
A printed list of current popular slang, memes, and references
Will be unintelligible in 25 years — that's the point
A printed cost-of-living snapshot for your hometown
Median home price, rent, gas, groceries
A short essay: 'What I want the class to know when this opens'
Optional — only from classmates who want to write one
A printed copy of the reunion program from the night
Schedule, organizers, sponsors
Printed individual notes 'to the class of ____ at our next reunion'
Sealed in individual envelopes by each contributor
A current world map with notations of where classmates live
Will look very different at opening
A printed 'where I see myself in 10/25 years' from each contributor
The reading material that gets the biggest reactions
A small selection of memorabilia from the night — coasters, napkins, name tags
Tangible textures hit differently than printed photos
A current-year coin from each contributor's wallet
Cheap, dateable, fun to handle decades later
A printed digital photo from each contributor's phone — labeled with date and location
Snapshot of the era's photo aesthetic
A sealed envelope from the class president with one secret message
Builds anticipation for opening
🎉 With Reunly
Plan the capsule ceremony — and the rest of the reunion
From the moment contributors arrive on reunion night through the opening 10 or 25 years later.
Pre-burial / pre-sealing
On reunion night: set up a 'time capsule station' where classmates write their letters, sign the list, and contribute items. Give everyone about 30 minutes during the evening to write their letter to their future self. Have plenty of stationery, pens, and envelopes.
The sealing ceremony
Gather the room near the end of the night. The class president or organizer reads the list of what's inside. Each contributor briefly holds up their item before placing it in the capsule. Take a group photo with everyone around the open capsule. Seal it on stage (or out front the next morning if you're burying it).
The burial (if applicable)
Schedule the actual burial for the morning after the reunion. Get the principal, alumni director, or property owner there as a witness. Take dated photos. Mark the spot with GPS, photos, and a measured map. Save the map in three separate locations: with the alumni association, with the school, and with a designated alum.
The interim — keeping the secret alive
Send an annual reminder email to all contributors. Include the opening date in big text. Maintain a contact list and update it as people move. The single biggest failure mode for time capsules is losing track of where they are or when they're supposed to open.
The opening
10 or 25 years later, gather the class for the opening as the centerpiece of the next reunion. Open on stage, project each item on a screen, and read letters aloud. Plan for 30 to 45 minutes. Have tissues. Save the most personal items (letters from those who have passed, the class president's sealed message) for last.
For 5- to 10-year buried capsules: a stainless steel time-capsule cylinder rated for burial (about $80–$200 from time capsule specialists). For storage in a school's trophy case or someone's basement: a Pelican-style hard case with a silica gel pack works fine for under $100. Never use cardboard, untreated wood, or unsealed plastic — water will destroy your contents.
Bury at least 3 feet deep below the local frost line to prevent freeze damage and accidental discovery. Always get written permission from the property owner first — schools usually require board approval, and parks require formal permits. Map the location precisely (GPS coordinates + a photo + a measured triangulation from three landmarks) and store the map in three independent places.
Only with explicit written permission from the school district. Most districts have a formal process requiring board approval, a designated location chosen by facilities staff, and a record on file with the district. Plan on a 3-to-6-month approval timeline. Many alumni associations work directly with their old high school's facilities director — call them, not the principal.
Anything organic — food, plant matter, fresh flowers — will rot. Anything with batteries will corrode. CDs and DVDs degrade over decades. Anything embarrassing or potentially hurtful (yearbook signatures with old roast jokes) may not age well. Avoid scented items, anything with adhesive that could melt, and anything that requires technology to read (use printed photos, not USB drives, for long-term capsules).
The two best windows: 10 years (your next major reunion, attendees will still be in their 30s/40s and remember writing the contents) or 25 years (significant generational time has passed; the contents feel genuinely time-capsule-ish). Avoid 50+ years for class reunion capsules — many original contributors won't be present for the opening, which makes the ceremony feel more bittersweet than celebratory.
About 30 minutes total. Open the capsule on stage in front of the room. Read each item aloud or display it on a projector — letters from classmates are the highlight. Match each item with its contributor (or mark 'in memoriam' for any who have passed). Save the most personal items — class letters, a video message — for the end. Have tissues. The opening is more emotional than people expect.
Reunly's class reunion app keeps classmate contacts, RSVPs, and even time capsule contributor lists in one place — so when it's time to open, you know exactly who to call.
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