Carbon footprint (events)

You can't manage what you haven't measured, and for events the measurement itself is the hard part. Venue energy is easy to get; attendee travel, exhibitor freight, and stand-build materials require surveys, assumptions, and estimation models, which is why two calculators can produce quite different numbers for the same show. In practice, organizers pick a methodology, gather what data they can (registration postcodes for travel estimates, contractor material declarations, catering volumes), and accept that the first year's number is a rough baseline rather than an audited truth. The commercial reason to do it anyway: exhibitors' sustainability teams increasingly ask for per-event or per-attendee emissions figures, and organizers who can't answer look behind. The common mistake is measuring only what the organizer directly controls — venue power, print, signage — and declaring a small, flattering footprint that quietly excludes the travel and freight that make up most of the real total. The honest nuance is that footprints are estimates built on assumptions, and precision theatre helps nobody. Publishing your methodology and its gaps is more credible than publishing a suspiciously exact number, and consistency year over year matters more than absolute accuracy, because the trend is what shows whether anything's actually improving.