Aside from the weird and wonderful plants in its collection, there's something Sergeant Pepperish about Kew, so it was a doubly appropriate place for such an event.
The aim was to draw people's attention away from drugs, per se, back to the plants from which they're derived, and to make the point that people around the world have conceived these plants and their effects differently.
For example, plants that are seen as sacred by some indigenous cultures are regarded by ours as so dangerous that they can only be displayed in cages.
Others, meanwhile, remain quite legal...
...but all came with a warning...
Demand was such that on Sunday we were moved to a bigger venue. Two hundred seats proved insufficient and I'm told at least another hundred people were turned away. Here's part of the, ahem, 'kew', which stretched around the building.
What's clear is that despite the pariah status of the magic mushroom, and psychedelics more generally, interest in the subject grows unabated.