WordNet (r) 3.0 (2006):

rap session
    n 1: conversation in a situation where feelings can be expressed
         and criticized or supported

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "rap session":
   airing, analysis, buzz session, canvassing, colloquium, colloquy,
   conference, consideration, debate, debating, deliberation,
   dialectic, dialogue, discussion, examination, exchange of views,
   forum, investigation, joint discussion, logical analysis,
   logical discussion, open discussion, open forum, palaver,
   panel discussion, rap, review, seminar, study, symposium,
   town meeting, treatment, ventilation