But don't take my word for it. Go out and try it yourself. You'll become way more comfortable around unpredictable situations that can be easily translated when your hired on an event gig. Once you learn to observe and communicate well, you'll be able to find the best moments and capture them with ease. When it comes to events, sometimes stopping and taking it all in first can make a huge difference in your style of shooting. Learn the zen way of street photography and then apply the lessons learned in your money making work.
What's In My Bag?
Honestly, your gear should be the last thing to consider if you want to create great street photography but if I had the choice of anything I want I would use any full frame camera with a 50mm lens. To me, the 50mm is the perfect lens for that artistic look and you can be rather discreet while keeping a moderate distance. I've noticed the framing to be quite pleasing and keeps me relaxed while shooting. A fixed focal length make me feel more connected to the camera. I'm moving to get the proper shot, no need to rely on the camera's zoom.
But any lens will work. The most important bit is not the gear, it's the lighting, composition and most of all the story. Be a great story teller and you'll catch the attention of more then just the camera buffs but everyday people. If you can hook viewers more than beyond the technical, then you've got yourself a good thing going.