When seeing someone and you cannot remember their name I use some of these tricks:
The Honesty route:
1) Hi, It has been a while since we have seen each other, and my mind has just gone blank on your name, I am so sorry could you please refresh my memory.
The blame it on age:
2) It is good to see you again, but my memory seems to be getting worse with age, as I cannot seem to remember your name. Please forgive me.
3)You look wonderful! I was trying to find you on Facebook, what name do you go by so I can add you to my friend list.
The Phone Number and Address:
4) I have lost your phone number and address. Could you please write it down for me so I can put it in my address book.
The Business Card:
5)Hi! I would love to have some of your business cards to pass out, if you have some extra.
The Cell Phone:
6) Would you mind putting your information in my cell phone, so I can give you a call sometime?
These are different scenarios that can be used when you cannot remember someones name.
I hope this helps you with waysof getting names that you may not remember. Joan