A single tour can run through several presales before tickets reach the public. Each window corresponds to a party with a contractual claim on early access.
Presales pay for themselves in commitments made earlier
Promoters, venues, sponsors, credit card partners and fan clubs all provide something to a tour, and early access is a low-cost way to compensate them.
A sponsor gains a reason for customers to hold its card; the tour gains marketing reach and, in some arrangements, a direct payment.
Because the currency is access rather than cash, presales cost the tour inventory it would have sold anyway, which makes them unusually attractive to grant.
Each partner gets a separate window and allocation
Windows are sequenced so partners do not compete directly, and each receives a defined share of the available seats rather than open access to the room.
Codes exist to enforce those boundaries. A code identifies which window a buyer belongs to and which allocation their purchase draws from.
Allocations are set per show, which is why a code that works in one city produces nothing in another where the partner's share is already exhausted.
Demand measurement happens during the presales
The pattern of presale purchases tells the promoter which markets are strong before the general on-sale begins.
Additional dates are frequently added on that basis, which is why second shows appear immediately after a first one sells rather than weeks later.
Production holds also matter. Seats reserved for sightline obstructions, camera positions and guest lists are released only once the staging is finalized.
Registration systems changed the mechanics
Many tours now require advance registration, then distribute codes to a subset of registrants rather than to everyone who signed up.
The stated purpose is limiting automated purchasing, since a registration process can apply checks that an open sale cannot.
It also gives the tour a picture of demand by market before a single seat is sold, which improves routing and pricing decisions.
The public on-sale is smaller than it appears
By the time the general sale opens, a substantial portion of the house has already been allocated across presales, holds and partner blocks.
The remaining inventory can sell in minutes, which produces the impression that the general sale was never real.
It was real but small, and the practical response is to identify which presale a buyer legitimately qualifies for rather than waiting for the public window.