I find large groups exist in three states of matter:

1. crystalline / couple position: Couples sit around the table, there is about 15cm distance between each molecule. One person at the table holds the conch and speaks.

2. bipolar / sex-segregated: One end of the table holds all men, the other all women. The women talk about men and the men talk about poop and race cars.

3. gaseous: All people move freely around the room and bounce off each other, there is vigourous chatter everywhere. Often there is alcohol involved.

Your job as a host is to increase the temperature to where all molecules break apart and you reach gaseous forms of communication.