https://www.defcon.org/html/defcon-19/dc-19-cfp.html

xxxxxxxxxxxxxxxxxx xxx xx x xx DEF CON 19, Las Vegas 2011
xxxxxxxXXXXxxxxxxxxxxxxx xx x x August 4th - 7th, 2011
xxxxxxXXXXXXxxxxx x x x The Rio Hotel and Casino
xxxxxXXXXXXXXxxxxx xx x x ...