What is the PKA? Club, Group , What? Can anyone join?

Answer 1

It's the Pi Kappa Alpha student fraternity. It's only for men, and, after receiving your application, members will vet you to see if you are a suitable recruit.
"Pi Kappa Alpha consists of Scholars, Leaders, Athletes and Gentlemen. If you exemplify one or several of these ideals, you could be just the type of person that Pi Kappa Alpha is looking for. Pi Kappa Alpha is continuously working hard to find men who want to be champions, men who are dedicated to a common vision."
http://www.pka.com/