Hey. A journal club is where one person (the 'chair') chooses one or two recent papers/articles from a journal that is relevant to a particular theme. The paper is distributed to various people within the research group/school/faculty to give everyone a chance to read it. Then everyone meets to discuss the paper.
They are usually informal discussions over lunch, and hardly anyone ever reads the papers!
ofcourse, no one explained any of this to me when i started, so when i had to lead a journal club a few months ago, i made a powerpoint presentation explaining the details of a study INSTEAD of distributing the paper to everyone...i made a royal tit of myself, twas highly embarassing!