A friend with a medical condition told me this and I thought it is a great idea. If you have a medical condition, you should write on the back of your con badge something like:
I have [condition]. If I seem to be having a problem, please call [person] at [phone #]. If the condition is life-threatening, please call 911. Other emergency contacts: My MedicAlert #:
MedicAlert will tell the nice paramedics what drugs you're on and in what doses. This is really helpful information to have easily findable, especially if you have any condition that could potentially incapacitate you.