Disclaimer: I don’t own Middle-earth, however much I’d like to live there.
As he watched the pavilions rise and tables spring up across the Party Field, Bilbo pondered his Plan. Everything was in place, all the little details considered and taken care of. It would be a terrifically fun party, which would make his little joke all the more amusing.
And then he would be off on the road again, to see mountains and great forests. Eventually he would settle down...in Erebor, maybe. Or Rivendell. Somewhere far away and suitable for a Hobbit's retirement where he could finish his book...
And he lived happily ever after, to the end of his days.