I was thinking of mass transit, with planes to move the masses around Faerun, but I wonder if a more magical transit system would be a portal network.
I also thought of the Waterdeep underground, a subway system but that might run into trouble with Undermountain.
The Xanathar is still a crimelord, but I really want the latest iteration to be some sort of mafia-styled crimeboss.
If the nations are at relative peace, what would their version of the Olympics look like? The Lathanderan Games (apparently his church sponsors athletic competitions), but with so many different races throughout Faerun there might be some advantages and disadvantages between races (dwarves probably aren't going to win any 100 metre dasches and centaurs should probably be disqualified from competing). I can imagine it being a little like the Laff-a-lympics by Hanna Barbera.