The following announce is lazily copied from Paul Wise's announce. There is only one thing I like to add: the screenshots that are submitted and collected on screenshots.debian.net are visible on the packages websites (both Debian and Ubuntu) and are also used by the software-center package, so they help people to get a first impression of the package they might want to install.
Have you ever wondered how to start getting involved in Debian/Ubuntu? Do you enjoy discovering new games and playing them? You might want to come to the games screenshot party! We hope that the party will be a fun, easy, low-commitment way to get involved.
If you are interested in attending, please add your availability to the poll linked from the announcement so that we can get some idea of attendance and when is a good time for the people who are interested.
Look forward to lots of game playing, screenshots and merry time, hope to see you all there!