The factors and their approximate weights
Each factor is scored by the editors from 0 to 100 relative to the whole calendar, then combined with the weights above and rounded. Scores of 90 and above are labelled Defining, 80–89 Major, 65–79 Significant, 50–64 Notable, and below 50 Regional. Where a factor has not yet been scored it is treated as neutral and the rating is marked as such.
What it is for
The score orders what you see: which events lead the week, which count as “major” in the month ahead, which make the season line, how heavy a weekend reads in the index. It is not a recommendation to attend anything, and two events with the same score can be entirely different in character.
What it is not
It is not scientific and does not claim to be. There is no attendee data behind “concentration of influential attendees”; there is editorial reading of the publicly reported programme behind “private-event ecosystem”. Component scores are stored as structured data and reviewed by editors; they are not published, and the API returns only the total. Sponsorship never changes a score — see the advertising disclosure.