If you want to join the game, simply post your Lexember contributions in this thread. You can also use various social media instead or in addition: There will be #Lexember hashtags on Twitter and Google+, and some people are probably going to publish Lexember words on their conlanging blogs as well.
Topics of the Week:
- Dec 1-7: Categories, Structures, Relationships
- Dec 8-14: Social Interactions
Have fun!