As you have read, I was at a conference these past couple days. Also last week I graduated from Leadership Toledo. I want to compare the name tags of both organizations.
As with many groups, both had laminated name tags that were to be hung around the person's neck.
Where each was different was that one group printed the same information on both sides of the name tag and the other group only printed on one side. And you guessed it, more times than not, when I was trying to remember a name, all I could see was the blank white of the backside.
I noticed that I was a little more shy in this situation.
So my suggestion for conferences or any groups, is to print on both sides. Probably takes a little more ink and slightly more time, but the value to the people using them in priceless!