When you met someone or made contact and want to reach out to them with an email but you did not have the wherewithal to get their email, there is a tool that can help. Rappaportive is a GMail Tool that will scour the web to see if the email you are trying works.
When I would try to find someone the standard firstname.lastname@example.org was one of the first standards I would try. I would then proceed to send out other guesses and they bounce back letting me know if I had a bite. This tool can narrow it down a lot quicker by searching the web for emails through a lot of places to see if that address is the person you want. If you seek out people in this way give it a try.