|at - specific|
a specific time/place/address
We will meet at noon.
The meeting will be at the Hilton Village Inn.
He lives at 23 Main Street.
Meet us at the main entrance to the station.
|on - more general|
We are meeting on Friday
He hates working on weekends.
She was born on January 21, 1945.
There are water stations on Grace Boulevard and Marcus Street.
He lives on Main Street.
|in - the most general|
We have a meeting in January.
Carlson and Sons was established in 1962.
The meeting will be in the Culinary Arts Dining Room.