Sorry to dash your hopes, but this is unlikely in any build of the game, and will probably never be possible in the final build of the game. The last major update with the least amount of guest content definitely did not have enough days to finish them all. I think that this pattern will continue as they add more side content. And just to inform you, you probably can't help everyone (or exhaust their routes) in one save in the final build because this is a deliberate design choice by the devs. One of the devlogs explains this in detail