The Prevention Council of Bridgewater, Roxbury and Washington is hosting a free film screening this weekend.  Sno Babies will be shown at  Washington's River Walk Pavilion on Saturday at 7pm.  Organizers say it's hard to watch, but the gripping story is about the grim realities of addiction and the triumph and challenges of recovery from substance use disorders.  Roxbury residents Michael Lombardi, a Shepaug graduate, actor and producer of Sno Babies, and Alan Kovacs, producer will be on hand at the showing.  Each facet of the Sno Babies project raises money for The Global Recovery Initiatives Foundation, the first and only national community foundation dedicated to funding support services for people in early recovery from substance use disorders.