fair-n; 2 Senses

Sense Number 1: carnival or show

Commentary: FAIR[+event] A traveling show, primarily for entertainment.

I heard there's going to be a fair coming to town!
John and Mary attended the fair and held hands on the Ferris wheel.
I walked out of the fair and had to pay to get back in.

WordNet 2.0 Sense Numbers: 1

Sense Number 2: gathering of producers

Commentary: FAIR[+event] A gathering of business-people or producers, meant to promote business. Usually an adjective attached.

The book fair is being held in the library.
I met my business partner at the 1979 International Trade Fair.
The World's Fair brought travelers from all over.
John's cow won a blue ribbon at the County Fair.

WordNet 2.0 Sense Numbers: 2 3 4