"Americans go to a meeting"
Translation:Wamarekani wanaenda mkutanoni
The Tips and Notes section for Skill "Locatives" explains the locative suffix -ni, which can mean in, on, at, to and even from:
... some common nouns can be suffixed by –ni to form locations ... proper nouns are not suffixed by the suffix –ni, like countries
Chumba will become chumbani – in the room
Shule will become shuleni - at/to the school
Kijiji will become kijijini – in the village