Xubuntu always needs people interested in marketing and promoting the project. Our Marketing wiki lists all the current marketing and promotion projects we are working on as well as ideas for future projects.
Along with the Marketing wiki, the best way to get in touch with us is our development IRC channel #xubuntu-devel on Freenode.
The website team maintains the Xubuntu website content and code as well as the assets in the various subdomains. It also cooperates with the artwork, documentation and marketing teams in planning and creating the infrastructure for different kind of campaigns and content.