As prom seasons and graduation dates near, the Fairfax County School Board and the Board of Supervisors have joined forces to reduce underage drinking among teens.

Both boards designated May as “Parents Who Host, Lose the Most Month,” as part of a larger plan to address the dangers of alcohol consumption among the county’s youths. Sixty-five percent of underage youths say that they illegally obtain alcohol from friends and family, according to a Fairfax County schools statement.

In April, a Great Falls woman was arrested and charged with contributing to juvenile delinquency after police found a 15-year-old passed out in her home after a teenage party.

Fairfax County’s Unified Prevention Coalition will hold a “Saturday Night in the Suburbs” event Monday at 7 p.m. at West Springfield High School to foster a conversation about drug and alcohol use among teens.

On May 23, the coalition will host a program called “Sobering Up: How alcohol and drugs affect injury prevention” from 8 a.m. to 5 p.m. at the Inova Fairfax Medical Campus at 3300 Gallows Rd.

In a 2012 survey among Fairfax County youths, close to 35 percent of high school seniors and 19 percent of sophomores admitted that they had consumed alcohol in the past month. More than 18 percent of seniors in the survey said they had taken part in binge drinking in the past two weeks.