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Event data has one property that organisation data does not: most of it becomes unavailable once the event ends. A venue will pull a sub-meter reading for you during the build. Six weeks later, that period is gone and you are estimating from floor area. So the order is different. Ask first, measure during, reconcile after. For most events attendee travel is the largest single category by a wide margin, often outweighing everything else combined. Weight your effort accordingly.

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Venue and energy

Ask for sub-metering when you book, not when you report. Most venues can isolate a hall if asked in advance and cannot reconstruct it afterwards.

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Travel and accommodation

Attendee travel is nearly always estimated rather than measured, and that is fine. Add one optional question to registration asking the attendee’s postcode and how they expect to travel. Getting the mode split roughly right matters far more than precision on any individual journey.

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Suppliers, freight, and logistics

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Catering and food

Menu split is the number that moves this category. A caterer who can tell you covers by menu type gives you something far more useful than a total spend figure, and most can.

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Materials and waste

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Put it in the contract

The single highest-return action for event footprints is not a data request. It is a clause. Venue and supplier agreements are where you secure data while you still have bargaining power. Ask for:
  • A sub-meter reading for your halls covering your exact occupancy period
  • Waste tonnages by stream, split for build, event days, and pack-down
  • Catering covers by menu type
  • Freight weights and origins from your logistics provider
Suppliers who provide this routinely will say yes without hesitation. Suppliers who cannot are telling you something useful about how the rest of the relationship will go.

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