There are three ways to reach the Advent Calendar once it has started on 12/01. The first way is to navigate through the Map of Neopia; by going to Terror Mountain, you should be able to find a link to the Advent Calendar. The second way is to go to the homepage; on the top right, you should see an icon of Reina. Clicking on that icon will lead you to the Advent Calendar! Lastly, if you click on the Explore button at the top of the page a drop-down menu will appear that will have an option to take you right to the Advent Calendar.