the expo lachute fair is the oldest fair in quebec and the second-oldest in all of canada, running from 1825 to the present. in 1917, the argenteuil agricultural society purchased land to hold the expo lachute fair permanently in lachute. in 1917, the construction of the grandstand and the track was completed, with new cattle and horse barns being constructed as time and money allowed. the fall fair was changed to a spring fair in 1925 so that it could be deemed strictly a livestock show. lachute was not always host to the exhibition; from 1825 to 1826, inhabitants of the county of york met in the then-bustling business center of st. andrews, to form a society called the county of york agricultural society, later changed to the two mountains agricultural society, and finally the argenteuil agricultural society. today, the expo lachute fair is still going strong; an annual agriculture fair is held in july and the fall derby is in september. the fairgrounds are also used for several other local events throughout the year.