(Works with any size group, though it works best in groups of 5 to 15; if your group is much larger than 15, have people count off and break up into smaller groups. Allow two to three hours for this exercise. It's good for getting people to ask for what they want, and for making transparent the process of deciding whether or not to accede to the wishes of others.)
Start by having your group sit in a circle, hand out writing paper and pencils, and say, "We're all going to make three wishes tonight. We're all going to ask the group, or other people in the group, for three things that we want and that the group or the other people can give us or do for us here tonight during meeting time. Those asked can grant the wish or refuse it. Let's all think for a few minutes about what we want to ask for."
Then, ask the person to your right to recite their three wishes. Those asked to do, or for, something will write it down, but not respond immediately. Continue this process until everyone has stated her or his wishes. Then, ask for a vote on any wishes addressed to the entire group. Don't discuss them, as it would take too much time. For the group as a whole to grant a wish, everyone must agree to it. If there is no unanimous agreement, simply go on. Then go around in a circle again, asking each individual if he or she will grant the wishes addressed to them personally, and if so, why, and if not, why not. Finally, spend the rest of the meeting time fulfilling granted wishes, fulfilling any granted group wishes first. If time runs out before all granted wishes have been fulfilled, continue at the next scheduled meeting.
A slightly higher-stakes version of this exercise is to have the asking and granting/denying take place during a meeting, but to have the fulfilling take place away from the meeting and at times agreeable to the askers and granters. This allows more elaborate and more personal wishes to be expressed and granted than is possible during a meeting.