Event "a new world"

You need to unlock a strip of land all the way to the bridge so some grinding of Springfield Heights material will be required.

there is a shortcut. Some spots in the last 2 strips of land next to the bridge uses the currency from the first part of Springfield Heights, and you can access it from across the mountains. 150 furniture, 100 coffee, 200 furniture, then 150 coffee should get you to the bridge https://simpsonswiki.com/wiki/The_Simpsons:_Tapped_Out_Land_Expansions

you will still need to grind, but not any ads at least