With a simple reversal of numerical settings, it would become an Unknown People Alert Tree, that would draw attention to people who are not yet well connected to the others present.
aka the magic matching tree
A tree full of leds. When two people touch the RFID readers below the tree, they can see how far their Picnic keyword profiles match. The more they match the faster and intenser the leds blink. Could this be love? ;-) Or maybe a good business match! Come and check it out.