Spectacle, by designers David Rockwell and Bruce Mau, is a photobook documenting massive communal experiences, from the Kumbh Mela in India (above right) to a NASCAR race (above). It came out last year but I just read a glowing review at Cool Tools. Judging by the review, and the sample pages on the book's companion site, this looks to be a magnificent project. Big lesson? You gotta be there.
Link to buy Spectacle, Link to Spectacle site, Link to Cool Tools review