Sorry for the bad title but hope it makes sense. Im using Linkin Park's 2026 tour as reference.
August 2025
they were announced as Lolapalooza Mumbai India Headliners for January 2026
they also announced an Aus March 2026 tour for only Sydney, Melbourne, and Brisbane
November 2025- they announced a solo LP show on January 2026 on Bangalore India
December 2025- they announced an NZ and Adelaide leg in connection to their Aus tour for March 2026.
Honestly I find this a bit weird that they didnt announce all of this in one go.
It's a business. The money has to be there and it has to make financial sense. It's all about when the band and venue are available. Summer is peak touring time for Australia so March may have been best availability as not to compete with AC/DC and Metallica.
These tours are booked at least a year or so in advance but announced later. They get announced based on the deals they have with all the venues.