Renga is an old form of Japanese poetry related to Chinese forms of short poems, predating even haiku. It is a tool for socializing happily, as people sit together and write single two or three-line verses according to content prescribed by a formula. The Renga Masters (Brendan Hewitt and Czandra) will choose from the verses produced, and link it with the next, and so on, for a total of 18 or 36 verses.
This form was used as a safe form for correspondence also: one poet sends three lines to her friend, who responds in two lines, and back and forth. Participants should be prepared to enjoy the exercise as a kind of game, but also need to observe the Asian formalism and respect it to some extent!