You will have to use the World map now to enter your Viking farm.
You will also use the map to keep up with any needed information.
  #1 - Lets you know something on the farm is ready to be harvested.
  #2 - Lets you know that Omar or Monty are on the farm.
  #3 - Lets you know how many days are left for the farm.
  #4 - Click on this icon to see the Event Overview window and your Ranking.
  #5 - Click on this icon to see the Event Information window.
  In this overview, you can see all the stages of the event. First visit Nils Nordson on his viking farm. Help him set up his farm and sell viking gear to earn runestones, which you can then exchange for valuable seeds with the runestone trader. When you sow these seeds in the greenhouse, you'll grow Nordic fruits that Captain Barmacle will ship. As a thank you, he'll give you a reward you can use to train your horses. Remember that you can only reach the viking farm event via the ice bridge, which last for 24 days. 

UPDATE MARCH 2017: The Viking farm was shortened from 30 to 24 days.