Fishing Tourney

The fishing tourney is a fish-catching event that occurs on the following dates throughout the year:
 * 3rd Saturday of January
 * 4th Sunday of February
 * 3rd Sunday of March
 * 4th Sunday of April
 * 3rd Sunday of May
 * 3rd Sunday of October
 * 3rd Sunday of November
 * 3rd Sunday of December

Although the tournament starts at 12 A.M., you can use any previously caught fish in it. Take the fish to Tortimer who is outside of the Town Hall. If it is the biggest caught fish that day, you get the prize of a random item. However, a villager may later submit a larger fish, so you have to keep trying. If at 6 P.M. you still have the largest fish caught, you will win the Fish Trophy, which is mailed to you. If you don't have a fishing rod at the beginning, just talk to Tortimer for a free one.

Animal Crossing: City Folk
In Animal Crossing: City Folk dates are at differents times then in the prequels (such as on Feb 14th, the second Saturday of the month) and have yet to be officially identified. Also instead of mayor Tortimer being in charge of the event, a beaver named Chip is in charge and stands out in front of Town hall with his tent full of coolers, and is standing eagerly for contestants to bring in fish to be measured, after which he eats your submission. Winning the tourney nets you a Silver Trophy.