Each figure comes from the source named beside it, and links to the page or report that states it. Ratings keep the scale and count of the provider that published them; they are never combined into a single score.

Audience figures are shown as their source words them — “about”, “more than”, a range, or an expectation — with the edition they describe. A figure for an earlier edition is labelled as such and is not a forecast for this one. Registrations, admissions and visits are not the same as individual attendees, and a figure for a combined conference and exhibition covers both.

Where a source has no figure, nothing is shown. The absence of a figure does not mean the event had no audience or no reviews.