(Works with any number. A fun, light exercise.)
Have everyone in the group write down a wish on a piece of paper. The wish can be about anything--within limits set by the group, or without limits; it can involve other individuals by name, other unnamed individuals, or be purely abstract. Then, fold the paper in half and place it in a box with the wishes of the other individuals in the group. When all of the papers are in the box, pull out and read aloud the wishes one by one. After each wish is read, ask if anyone wants to acknowledge it as their own by raising their hand, or if they share the wish and wish to acknowledge that by raising their hand(s). If the wish is directed to an individual in the group, s/he can either grant it or refuse to grant it to any or all of those asking it. If someone owns a wish not directed to an individual, ask if anyone in the group would like to fulfill it.