Courier's Run

A marathon-of-sorts where interested members of the Courier's guild plan out delivery routes and race to deliver messages and packages. This is how members of any rank progress outside of standard promotion, as the Street Runners will challenge each other, or someone of the rank immediately above theirs in formally-issued challenges.
A new guildmaster is selected through a Courier's run when a third of the messages carried by the Couriers are mis-delivered or lost without satisfactory explanation, and enough of the lower rank (name pending)have issued Run Challenges.