The Winter Builder's Event and the Summer Builder's Event of last year are both Community Events made to replace the Strongman Events Diggy's Adventure used to have. Both have a single item which can be purchased in the Shop from the Ticket each player can collect. Like with the Summer Builder's Event, the Camp Equipment item is 2 slots wide and 4 squares high, so it will ONLY fit in your Camp in the 4 high rows. You will need two of those slots, as mentioned, and they will need to be side by side. Most of the Materials you need to clear two slots in one of the four high rows can be found in the Event itself, so if you save those Materials to clear those slots you should have no problems.
If you have any questions, please feel free to ask. Thank you.