Here is a writeup of that cooking event I wa looking for last month
This requires you to cook all five holiday recipes. You'll need to have at least 280 cooking skill to make all of them, but if you haven't leveled cooking, don't worry; Pilgrim's Bounty exists for just this reason.
The recipes you'll need are all from a single book sold for one silver by Pilgrim's Bounty vendors (all of whom will be located in feast areas). The book is called the Bountiful Cookbook and requires only 1 Cooking in order to use. Right-click the book once it's in your inventory, and it'll give you all five recipes.
The recipes you'll need to cook are:
Spice Bread Stuffing (requires one cooking skill): This one is the only recipe that uses an existing cooking item, but fortunately for us, it's the earliest one available -- one Spice Bread plus one Autumnal Herbs.
Pumpkin Pie (requires 100 cooking skill): one Ripe Elwynn Pumpkin (Alliance, purchased from the Stormwind vendor) or Ripe Tirisfal Pumpkin (Horde, purchased from the Undercity vendor), plus one Honey.
Cranberry Chutney (requires 160 cooking skill): one Tangy Wetland Cranberries (Alliance, purchased from the Ironforge vendor) or Tangy Southfury Cranberries (Horde, purchased from the Orgrimmar vendor), plus one Honey.
Candied Sweet Potato (requires 220 cooking skill): one Teldrassil Sweet Potato (Alliance, purchased from the Darnassus vendor) or Mulgore Sweet Potato (Horde, purchased from the Thunder Bluff vendor), plus one Honey and one Autumnal Herbs.
Slow-Roasted Turkey (requires 280 cooking skill): For this recipe, you'll need to make a trip to Elwynn Forest or Tirisfal Glades in order to get Wild Turkey, which is a 100% drop off the Wild Turkey mobs that spawn there for the duration of the holiday. One Wild Turkey per recipe, plus two Honey and one Autumnal Herbs.
Pilgrim's Bounty vendors sell the Simple Flour, Refreshing Spring Water, Mild Spices, Honey, and Autumnal Herbs you'll need for all five recipes, so you won't need to make any special trips for ingredients beyond turkeys. You don't even need to train cooking elsewhere; there'll be a cooking trainer in the feast areas too! Vendors in Stormwind/Undercity, Orgrimmar/Ironforge, and Darnassus/Thunder Bluff will also sell you the pumpkins, cranberries, and sweet potatoes (respectively) you'll need, so until you reach 280 cooking skill you won't even need to set foot outside your faction's major cities. If you want to make things especially convenient for yourself, make sure you cook at least 20 of each recipe so you can turn them into holiday NPCs for Pilgrim's Progress.
Once you get to the Slow-Roasted Turkey recipe, you'll need to make a hunting trip to Elwynn Forest or Tirisfal Glades. For the length of the holiday, low-level Wild Turkey mobs with two HP spawn all over these zones, and their meat is a 100 percent drop. As long as you're out stocking up on them for cooking purposes, you might as well do --
