I am guessing the event is all over now... but I still seem to be able to go through each of the puzzles to "catch up" so to speak. I joined my team, and have been "adventuring" along. I've managed to get to the Iron Door and open it for the puzzle within, but I'm at a loss as to what to do with the puzzle. I can't click on any part of it, nor make it slide/move/activate at all. Am I doing something wrong? I'd like to get through this (even if I am late in joining)... or is this no longer working and this will be as far as I can get in the event?

You have to use the arrow keys to move the pieces. All of the pieces on the board will move in the direction of the arrow you press (unless they are already against a wall).

Ahhh okay! I was trying to click on everything... just did not think of using the keys. Thanks much!