There are a lot of different viewpoints on "street photography", including wide views of city streets with crowds of people (your 28mm or even an 18mm kit lens) to street portraits that isolate one person (your 135mm is good for that).
You don't need a fast lens for daytime street photos, so consider bringing something versatile like an 18-50. That lets you practice different focal lengths, and at the wide end works well for hyperfocal or zone focusing if that's part of the class. Most kit lenses don't have depth of field markings, though, so there's some guesswork with it. Bring your 28mm lens because it has those dof markings if they prove important during class, plus the 135mm if you have bag space.
Last edited by DeadJohn; 06-21-2016 at 08:17 PM.