The Forks posters appear to be all over town, even in places such as the Prescott Dormitories at Blackwell Academy and Chloe's bedroom. It is unknown what The Forks is, though it appears to be very popular in Arcadia Bay.
It is completely unknown what the poster references, although some suggest that the poster is for a local band or restaurant. However, the poster is most likely just a piece of filler added by the developers to create a more lived-in atmosphere for the game's world.
The Forks logo poster appears to be dirty around the edges, square, and white with a scared or startled sentient piece of food on the cover (most likely a peach or tomato). It has the name "The Forks" under it with a small fork logo.
A The Forks poster in the Blackwell Dormitories.