A friend and I were doing this in Houston, but to tell you the truth, there is a better gig you can do right now.
Windws XP is over. People using it re going to be hacked, and it is not fixable. XP is no longer supported, and anytime a vista/7 vulnerability is found, the XP version does not get fixed. As time goes by, more and more people are getting hacked with XP, and they do not know it.
Antivirus isn't going to help.
Millions of people are still using XP, either because they do not understand how dangerous it is now, or they don't know it is obsolete. Many of you on this forum still are using XP, and not planning to stop. They are fools, and potential customers.
Right now we are educating people on the hazards of XP, and switching them to either Unbunto or the REACT os. (React is a XP placement that acts just like windows.)
It only takes pointing businesses to the articles online to point out that they are in danger, real danger, of losing their business and personal information to hackers if they continue using XP. This information is on every major tech site, and it scares the hell out of them.
We are doing pretty good educating the folks and switching them to Linux (with WINE) or React.
This is a method that will work only for a little while, but right now its on fire. The more people are ignoring it in your community, the more customers you have available. All you have to do is explain that they are risking everything if they are using XP, and point them to the professionals in the world to confirm it.