In practice these events almost always are based in East Asian countries with a professional system: in Japan for go and shogi, and in China, South Korea and Taiwan for go.
The system originated from competitions sponsored by Japanese newspapers, and has the effect that major events are spread out over a whole year of preliminaries, with a matchplay final that takes place over a month or two.
While this makes tournaments slow-moving and diffuse by the standards of some other mind sports, rather than happening in a single place over a short time span, the system is well entrenched.
The sponsoring newspapers can fill a daily column easily throughout the year, while the players can juggle commitments to a number of tournaments and outside interests by asking for scheduling that fits in everything.
In the past it took longer; for Meijinsen of shogi in Japan, its earliest final games were designed to take three days.
The most common measure of a top go and shogi player's success, in Japan at least, is the total number of titles accumulated.