The Grateful Dead invented 420

The argument

This argument traces the term 420 to a specific documented occasion and then attributes it to the band at whose concert that occasion took place. The evidence is a 1990 Grateful Dead concert at the Oakland-Alameda County Coliseum, where flyers were passed out among those attending. The flyers recommended smoking marijuana at 4:20. The purpose behind them is unknown, and the argument does not claim to know it; what matters is that the flyers existed, that they were distributed, and that they explicitly stated the time in reference to cannabis. From that the reasoning proceeds in two moves. The first concerns the origin of the term itself. Because the flyers tie 4:20 directly to the smoking of marijuana, and because they constitute a concrete instance of that pairing being circulated to a crowd, the concert can be treated as the point at which the association entered general use. That is what is meant by considering the concert the origin of 420: not that nobody had ever said the numbers before, but that this is where the usage was propagated. The second move assigns responsibility. The flyers were handed out at a Grateful Dead concert, to an audience the band had assembled, in a setting the band created. The Grateful Dead's connection with marijuana was in any case infamous, so the pairing of the band with the practice was already established in the public mind rather than incidental to the occasion. Given that the distribution happened at their event and among their followers, the term is credited to them by proxy. On this account the Grateful Dead invented 420, and its origin lies in music rather than in law enforcement or any other source.

Premises

Counter-arguments

This position misconstrues the connection of the Grateful Dead with a member of the Waldos, who actually started 420. Also, this association does not necessarily indicate that the Grateful Dead coined the term because association is not causation. The link between the Grateful Dead and 420 is casual. The fact that it originated it at a Grateful Dead concert does not mean they started it; it means that someone at or around that concert started it.

Rejecting the premises

[Rejecting P1] A flyer distributed at a concert in 1990 tells us the term was already in circulation and understood by the people receiving it, which is evidence of transmission rather than of origin — an invented term does not appear on a handout that assumes its audience knows what it means. [Rejecting P2] "By proxy" is doing all the work in the second premise: the band did not write or distribute the flyer, and the account documented elsewhere traces the term to a group of California high-school students in the early 1970s, with the Dead's role being to spread it through their audience.