Alternatives to Violence Project: Railroad Street Youth Project will host an AVP: Alternatives to Violence Project workshop, from 9 a.m. to 9 p.m. Saturday and 9 a.m. to 5:30 p.m. Sunday at RSYP's Drop-in Center, 60 Bridge St., Great Barrington.
Youths, age 14 to 25, will learn how to come together, promote and facilitate ways to positively resolve and negotiate conflicts. Issues the group will address will include domestic and sexual violence, physical and drug-related violence and the roots of violence.
The cost is on a sliding scale of $10 to $20, with scholarships available. Breakfast, lunch and dinner will be provided.
'Heating Up Cold Cases': The Osher Lifelong Learning Institute's (OLLI) Distinguished Speaker Series will present a talk, "Heating Up Cold Cases," with criminal justice professor Sarah L. Stein, Ph.D., at 10:30 a.m. on Saturday, room K-111 of the Koussevitsky Arts Center at Berkshire Community College, 1350 West St., Pittsfield.
Tickets, available at the door, are $10 for OLLI members and $15 for the public.
Stein is an assistant professor of criminal justice at Western New England University, and serves as a consultant for the Center for the Resolution of Unresolved Crime (thecruc.com). She will discuss how and why there are more than 185,000 unsolved murder cases in the United States.
Information: (413) 236-2190 or berkshireolli.org.
Butterflies at Mountain Meadow: Local naturalist Pamela Weatherbee will lead a butterfly walk at Mountain Meadow Preserve in Williamstown beginning at 1 p.m. Sunday.
Participants will learn how to identify native butterflies. Bring sun protection, clothes and shoes for walking through fields.
The program is open to the public and free. Rain cancels the event. Information: (413) 458-3135 or firstname.lastname@example.org.
Directions: From the intersection of Routes 2 and 7 in Williamstown, take Route 7 north. Bear right onto Mason Street, across from The Chef's Hat diner. You'll take a steep dirt road uphill to the entrance and parking.
'Movies at the Park': Greylock Federal Credit Union will screen free family-friendly movies on Fridays at dusk, from July 11 through Aug. 1, at Clapp Park on West Housatonic Street in Pittsfield. People are encouraged to bring lawn chairs and picnic baskets; no alcohol is allowed.
The schedule is: "Monsters University" on Friday; "Despicable Me 2" on July 18; "Zookeeper" on July 25 and "Rudy" on Aug. 1. Rain dates are Aug. 8 and 15. Information: greylock.org.
Planetarium shows: Williams College will offers summer shows at its Milham Planetarium, located inside the Old Hopkins Observatory at Williams College in Williamstown.
Free shows for the public will be offered at 8 p.m. Tuesdays and Thursdays: July 8 through Aug. 14.
Shows will be hosted by Williams College alumnus Muzhou Lu, students, Teddy Amdur and Allison Carter, and Keck visiting scholar, Adam Schiff.
Reservations (recommended): Michele Rech at (413) 597-2188 or email at email@example.com.