As part of a big celebration - wedding, anniversary, festival, etc. - you could create a time capsule of sorts, one that could either be sealed to be opened later, or one that could be curated and shared on a website or permanent physical display.

You could set up an area at your event for participating in the time capsule, and include:

• a journal/notebook for people to share their thoughts and messages
• some prompts/questions to help inspire them
• a photo booth with props/costume pieces/backgrounds for people to take pictures for the time capsule (and themselves)
• a supply of creative materials for people to create paintings, drawings, collage, or scrapbook pages
• news items, events lists, cultural references and paraphernalia for people to share and comment on