I hope I at least get 10 answers right in a row or I'm going to not call myself a hardcord otaku anymore. :(
You have to have a gold membership for X-box 360 to play 1 Vs 100. Heres a link for the times.
Also check you X-box dashboard if the time in your area match-up. http://www.xbox.com/en-US/live/1vs100/