Foo Camp handed the conference agenda to its attendees and invented the unconference

After the dotcom bust, O'Reilly Media had empty offices in Sebastopol and a community of innovators it wanted to thank. Conferences then were speaker-and-slide affairs: the audience listened, and the real conversations happened in the hallway. Tim O'Reilly wanted to see what would happen if the hallway became the whole conference.

Run a conference with no program: hand the schedule to attendees on whiteboards Friday night, pitch tents on the lawn, and let 200 invited geeks invent the sessions.

O'Reilly invited about 200 'Friends of O'Reilly' — founders, engineers, scientists, writers — to camp on its lawn for a weekend, providing food, showers and Wi-Fi but no program. On Friday night the attendees wrote the schedule themselves on whiteboard grids, rewrote it as the weekend went, and ran sessions on whatever they cared about, from killing spam to BitTorrent and new feed formats.

The weekend produced working collaborations: an anti-spam approach from Tim Bray, Jeremy Zawodny and Doug Cutting, and a newsfeed syndication format hacked up by Zawodny with Technorati founder David Sifry. The 'unconference' format it named spread everywhere — BarCamp followed in 2005 and the whiteboard-built agenda is now standard at hackathons and even scientific meetings.

After the dotcom bust, technology publisher O'Reilly Media had a new building with a lot of empty space and a community of innovators it wanted to thank. In October 2003 it invited around 200 'Friends of O'Reilly' to camp on its Sebastopol campus for a weekend. The radical part was what the hosts refused to do: there was no agenda until Friday night, when the attendees made one up on the fly.

The mechanics were simple. Whiteboard grids became the schedule, rewritten or overwritten whenever the crowd's interests shifted; tents went up in the orchard, Wi-Fi went up everywhere, and the company supplied food, showers and meeting space. Attendees ranged from Google founders to a vice chairman of Warburg Pincus; sessions produced an anti-spam proposal from Tim Bray, Jeremy Zawodny and Doug Cutting, and a newsfeed standard that Zawodny hacked up with Technorati's David Sifry.

The format, soon called an unconference, turned out to be the most portable idea of the weekend. BarCamp, an open-to-all copy, followed in 2005; topical variants ran at Google's campus; and the whiteboard-built agenda has since become a standard tool at hackathons, meetups and even scientific conferences. O'Reilly's own summary of the experiment: the output is not what the host learns, but what the guests teach each other.

Conferences optimize for speakers, not conversations; making the agenda an attendee artifact flipped the ratio toward hallway conversations.

The whiteboard schedule doubled as a live index of who cared about what — you could find your collaborators by reading the grid.

Tents, shared meals and a bar kept serendipity running around the clock instead of ending at 5 p.m.

Curation plus freedom: invite the right 200 people, then let them self-organize — trust replaced programming.

The best programming decision is sometimes to refuse to program: give a trusted, diverse crowd a blank schedule and real co-presence, and they will build the sessions nobody would have booked.

Foo Camp became O'Reilly's annual invitation-only tradition and seeded topical spin-offs such as Science Foo Camp at Google's campus. Its bigger legacy is structural: BarCamp turned the format into an open template anyone could run, and by 2018 Nature was reporting that unconference formats had reached scientific meetings, where the most valuable exchanges had always been the ones between sessions. O'Reilly draws the lesson as a business principle: the experiment worked because it created 'more value than you capture' — the camp was a thank-you that kept returning value for two decades.