There is a fairly large festival in Australia called Splendor in the Grass. It's a few days of truly amazing fun and each time I have gone I have come across lovely young ladies, with whom you only have fleeting moments, somewhat like Carnival. While at a festival you can sometimes get stuck by yourself (I have always gone with a group of people) and depending on your state this can suck. Mobile reception is toast at festivals and batteries never last a day due to loads of poncy self photography and updates to bookface.

10 years ago I had the idea of a bracelet (thing clear plastic "Live Strong") that when you raised your hand in the air, would flash at a certain rate alerting you to both the distance and direction of your closest "buddy" or person whom you had paired with. Very much like a super even wristband. When you and your crew arrived you would all "synch up" think hands in "Go team" pre sporting matchtype of thing. Then lest on of you be lost your closest buddy could be found. anyone by themselves would flash red say persons coupled up or in more than 2 would be green etc. And even better when you met up with that handsome chap or lovely lass you could "make a connection" and then perhaps find him/her again if chance or 15,000 people going mental to Matisyahu split you apart.

I assume before the festival was setup the entire grounds would need to setup with a massive wifi like mesh and you would need various "FestiTrak" waypoints where upon running out of battery you could have your bracelet (and contacts) duped and replaced with a fully charged unit.

Obviously it's all much more complicated than that buts it's a 10 year old idea that I would pay $20 bucks for at a festival. Now I must shower.