There is a fair in Stardew Valley on the 16th of Fall. It is a festival which celebrates the farmers and local producers and gives you a chance to show off the diversity of your items as well as their quality. The fair is centred on the Grange Display which allows you to choose 9 items for your display and based on those items your whole farm will be judged. That is not the only thing that is available at the festival. You can also play a multitude of games that will allow you to win the basic currency in this festival which is the Star Tokens. Star Tokens can only be earned in this festival and they are useful because they let you buy stuff that normally you can't, like a Stardrop. It's only available once though, after you've bought it once you can't buy it ever again from this festival. The Grange Display is also important because of this aspect. The winner gets 1000 Star Tokens. That is a pretty big amount and is well worth the effort. Now let's discuss what the display actually entails and how to win.
It's almost impossible to win this festival in the first year because there simply isn't enough time to get all the required items to win. What you exactly need to do is to start gathering up items from the start of the year so that you can display those items when the time comes. The produce that you can gather comes from 8 categories.
The categories are Vegetables, Artisan Goods, Fish, Foraging Goods or Flowers, Animals Products, Cooking, Fruits and Minerals. The main categories that you should focus on are Fruits, Animal Products, Foraging and Artisan products because those items are worth the most points when they judge you. The other items that you can work towards are Fish and Vegetables but those items are not worth as many points as the other four but are useful nonetheless.
The judging process works something like this: Gold Star items are worth the most as they carry the most points. You should also take care of the price of the item. If the item is of gold quality and more than 200 gold then it is worth putting on display. You get more points if you put up items of different categories as they also judge you on your diversity as well as the quality of your goods.
Fishing is tricky because it is extremely difficult to catch a gold or iridium quality fish but it is possible, all you need is a good rod and the best luck that you can have. That means you should keep an eye on the luck reading in the T.V in your house and go fishing on days on which your luck is the highest.
It is not difficult to win in the fair as long as you make sure that you keep the goods worth the most instead of selling them right off the bat because winning the fair will make you eligible for some sweet rewards that aren’t available in the game normally.