[X] Relax in the hot spring (invite Luna)
There may be an interesting encounter. If not, Shinji gets a nice moment of (desperately needed) relaxation and quiet before his gathering, alone or with his partner.
[X] Talk to the Press
This is the last time in a good while we get to speak to international journalists, might as well take the chance to clear some things up now that we're a bit more focused.
[x] Organize a last, private (away from the press), toast / gathering - inviting the surviving champions and their guests to rekindle the spirit of friendship and fair competition.
As long as Shinji doesn't drink a drop and he gets to talk with each of the champions (and some of their guests), it's fine. This also eliminates the need to go looking for Gabs and Lestrange, and having all remaining champions together in a casual mood does sound like something that might help cheer Ka'au a bit. Also Shinji gets to spend a bit more time with Luna in a nice enough setting before all of tomorrow's craziness.