I think something like the Zenith of Things Tournament from Gunnm/Battle Angel Alita would be a fun hook for an EP campaign, as well as something that makes a fair amount of sense in-setting giving that backups, forks, and resleeving exist, making death sports more widely accepted.
Who do you think would send teams? I can imagine Direct Action, Medusan Shield, Hyoden, the Jovians, and the Barsoomians fielding teams, for example.
What kinds of hooks would work? Aside from just having the players be part of the tournament, you could have them deal with match fixing, terror attacks, and Exsurgent presence among the competitors.
23 Liminal Blossom Punctures the Heart of the Unrepentant, Deliciously