What time is the G-20 Summit in Pittsburgh?

I am so nervous about next Thursday September 24th and Friday September 25th about that summit. I take the bus to work and I heard there will be lots of protestors and streets blocked off. I work from 10:00-6:00 in town and I wanted to know if anyone knows what time the conference is with Obama? Does anyone know what times will be the most CONGESTED AND CRAZY DOWNTOWN AND WHERE?