How many people attended the 1969 Woodstock festival?

How to get close to this number

Estimate from the gap between planning and reality. The organisers sold tickets in the tens of thousands, and the story of the event is that far more people arrived than were expected. A festival that becomes legendary for being overwhelmed typically sees several times its planned attendance, which puts the figure in the hundreds of thousands.

The moment the fences came down is what makes the number both large and unknowable. Once admission stopped being controlled on the first day, there was no gate and no count, so every figure is an estimate from aerial photographs and organiser recollection. This is the same condition as the free-concert record on this site: uncounted crowds are the largest ones.

The commercial detail in the explanation is the one worth keeping. The decision that made the event culturally immortal also made it a financial disaster, because a paying event with no paying attendees does not recover its costs. Legend and business outcome are frequently inversely related, and this is the clearest example in popular music.