Two sources, both labelled on every listing. Most records were compiled by our research team from the organizer’s own public event page — fee, dates, guaranteed games, refund wording, divisions. The rest were submitted by organizers directly, which also claims the record if we had already written one.
A verified marker means we have confirmed the organization runs the event it claims to run. It is not a quality judgement — a verified organizer can still score poorly, and several do.
We cover 12 sports — ice hockey, soccer, american football, lacrosse, baseball, basketball, volleyball, tennis, pickleball, golf, boxing, martial arts — filed under 6 regions: United States, Canada, Latin America, Europe, Middle East & Africa, Asia-Pacific, and in two divisions: youth and adult.
Cost medians are computed per sport, never pooled across them: a hockey weekend and a basketball weekend do not share a price floor. They are computed per division as well, for the same reason read one step further. An adult roster paying a few hundred dollars between them and a 14U team paying a few thousand are not choosing between each other, so pooling the two would move the figure both are measured against — half the youth index would read as a bargain and every adult listing as dear, on nothing but how many of each we happen to have filed. A sport-and-division bucket needs at least 4 listings with a published team price before it gets a median of its own; below that the listing is measured against its sport as a whole and the detail page says which of the two was used. A median over one or two listings is not a market, it is those listings grading themselves.
Medians are not computed per region, so a cheap regional market reads as good value against its sport worldwide.
What that adds up to — how many listings are filed per sport and region, the two classes of competition we deliberately leave out, and which cells are still empty — is set out separately, because it is a question about the index rather than about the arithmetic. What is in the index, and what is not.