About three weeks ago, I attended a career fair at my school. The decision was made last minute, so I didn't know I needed to bring a résumé. In fact, I didn't even have one because this was the first time I had taken action towards getting a summer internship (I'm a junior in college). It has taken me the past three weeks to write a résumé I feel confident sending in.
When e-mailing companies, what are the pros and cons of mentioning that I met them at the career fair? Will it be beneficial because there is a greater connection, or harmful because it raises the question of why I didn't apply sooner? Should I bother explaining everything to them, or is that just superfluous fluff? Is there any specific thing I should try to mention or be careful to avoid?
Potentially relevant details:
I don't have the actual e-mails of any of the people I spoke with, just generic firstname.lastname@example.org pamphlets and business cards. Furthermore, I'm having a hard time remembering the names of the specific people I spoke with.