Trade your unused stuff

I recently heard about a group of women that hold a monthly trade session.  How it works is everyone gets together once a month and hold a kind of trading session.  It's kind of like a donation/yard sale/swap meet event.  How we work the trades are determined by the group.  The group that I saw simply brought what they didn't want and anyone could take the stuff that the other people brought.  Any items not wanted, the hostess took and donated to a local charity.  I thought this sounded kind of neat.  The items ranged from clothing to household appliances to toys and anything else your household no longer has a use for.