A January court hearing is scheduled to consider the evidence against a Los Gatos woman charged with arranging for her teen son to host parties full of liquor and sex for his underaged high school classmates.

Shannon O’Connor, 48, pleaded not guilty Monday to the 39 charges she faces, including felony child endangerment and misdemeanors for furnishing liquor to minors, child molestation and sexual battery related to parties she allegedly arranged or hosted for her older son when he was a Los Gatos High School freshman.

The court set a Jan. 23 date for a preliminary hearing in which prosecutors present evidence against the accused and a judge decides if it’s sufficient to warrant a trial. It is often the first opportunity for the defense to challenge evidence against the accused.

According to court filings by prosecutors in the bombshell case that rocked the South Bay town, O’Connor arranged for the teens to sneak out of their homes at night without telling their parents.

“After the children were drunk on the alcohol she provided, she encouraged them to engage in sexual activity with each other,” prosecutors alleged, and “even facilitated the sexual encounters, some consensual and some nonconsensual.”

O’Connor was arrested a year ago in Idaho, where she and her older son had moved and where two girls who were among the 15 alleged teen victims live. O’Connor has remained in Santa Clara County jail after a judge rejected her request to be allowed to post bail.

At O’Connor’s bail hearing in February, teen girls who attended the parties told Santa Clara County Superior Court Judge Johnny Gogo that they feared O’Connor would menace them if freed. One tearfully testified that “she robbed me of my innocence.”