Designing evaluation infrastructure for psychedelic harm reduction at events: a methodological framework with formative mixed-methods field application

A methodological paper proposes an evaluation framework for psychedelic harm reduction services at events and tests it formatively with the Zendo Project at two large gatherings. Data came from 19 pre-event surveys, five retained post-event surveys and two matched pre/post records from medical personnel. The authors stress that the favourable views reflect staff perceptions rather than independently verified effects.