An Arvada woman accused of hosting parties with sex, drug and alcohol so high school students would think she was "cool" is expected to enter a plea Monday. Silvia Johnson, 40, has had two previously scheduled arraignments postponed. She faces multiple counts of sexual assault, distributing a controlled substance and contributing to the delinquency of minors. Authorities say Johnson hosted the parties at her home nearly every month for a year beginning in October 2003. She's accused of providing the teens with marijuana, methamphetamine and alcohol at the parties. The story has since made national news, with some alleged victims...