Hiya BA. Is it worth looking around at websites like this kind of one for ideas?

http://www.bonus.com/bonus/list/n_wordplay.right.html
edit:http://puzzlemaker.school.discovery.com/
http://dictionary.reference.com/fun/

Even if you immediately discard most, you may get an interesting idea or two that would be manageable IRL without computer mediation. You could also try a panel-game type version of our Hogwash, with zany and plausibly mad mutiple definitions of selected words.

For poetry based fun, how about printing out a couple of poems that the group know/like/hate, then slicing and dicing the lines to make new poems, perhaps in two teams? Or, harder, one team set the other a well-known story (eg, Red Riding Hood) with the task of relating it in the general style of a printed poem offered as a sample (for example something by Keats)? I am sure Juan and Wordwind and others will come in with some muchbetter ideas, but maybe this'll get the other sleepyheads to help you ;)

Good luck - great initiative!