World Fair Trade Day Celebration

celebration
a joyful occasion for special festivities to mark some happy event
any joyous diversion
the public performance of a sacrament or solemn ceremony with all appropriate ritual; "the celebration of marriage"
The action of marking one's pleasure at an important event or occasion by engaging in enjoyable, typically social, activity

world fair
The IBM Pavilion at the New York World's Fair closes, having hosted more than 10 million visitors during its two-year existence.^[126]
World's Fair, World Fair, Universal Exposition, and Expo (short for "exposition"), are names given to various large public exhibitions held in different parts of the world.

trade
Buy or sell (a particular item or product)
the commercial exchange (buying and selling on domestic or international markets) of goods and services; "Venice was an important center of trade with the East"; "they are accused of conspiring to constrain trade"
the skilled practice of a practical occupation; "he learned his trade as an apprentice"
Buy and sell goods and services
engage in the trade of; "he is merchandising telephone sets"
(esp. of shares or currency) Be bought and sold at a specified price

day
some point or period in time; "it should arrive any day now"; "after that day she never trusted him again"; "those were the days"; "these days it is not unusual"
Carried out during the day as opposed to the evening or at night
(of a person) Working during the day as opposed to at night
time for Earth to make a complete rotation on its axis; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day"
a day assigned to a particular purpose or observance; "Mother's Day"