There are many variations on this one but it's all the same concept. This one is my favorite: Set up a bunch of tables with candles on them each of which has a different set of discussion topics on them relating to anything from fears and dreams to hobbies and family life. have kids sit down in groups (i've found that 2-4 works best) around the tables and bring them tea and cookies while they talk to each other. Have them switch tables often, encouraging them to try not to sit with anyone they've already spoken with. Tends to be more effective the older the chanichim are, though all ages enjoy it.