bobsandiego wrote:I feel like an IDIOT!
At WorldCon, at least as recently as last year, there is a thing called the VooDoo board. It's a corkboard witha listing of all the registered memebrs and a set of car catalog type boxes, slips of paper, and push-pins. You can leave message for each other by slipping a noted into the right part of catalog (based on names) and then sticking a push pin into the board next to the person's name so that they can see that they have a waiting message.
It's how con goers did things before cell phones....
Ha! I was about to say, I'm sure I recall similar systems at events I've been to back in the Cretaceous era. That is so typical of science fiction. After all, the top-selling magazine in our field is still called Analog! Ha!