This Weekend in Somerville: Opera in Davis Square, Art and St. Patrick's Day

Dead Man Walking
The Boston Opera Collaborative puts on "Dead Man Walking" at Somerville Theatre. Here's a description from the opera company's website: "With a libretto by Terrence McNally, adapted from the first-hand account of Sister Helen Prejean, C.S.J., it speaks of faith, redemption, and the bonds of family as seen through the eyes of a nun who establishes a unique relationship with an inmate on Death Row at a Louisiana State Penitentiary." Performances are Friday and Saturday at 7:30 p.m. and Sunday at 3 p.m.

Ward 6 Democrats will elect delegates to this summer's state convention. The caucus is Saturday at 10:15 a.m. at the Somerville Community Baptist Church. All registered Democrats in Ward 6 are welcome. 

SLAM St. Patrick’s Local Artist Market
The market will feature some Irish-themed painting, photography, jewelry, textiles and more. It's at The Burren on Saturday at 12 p.m.

Memory Palace Opening Reception
This exhibit, featuring seven artists, explores "issues of memory and identity through painting, photographs, video and sculpture." The opening reception is at 6 p.m. Saturday at the Nave Gallery Annex in Davis Square.

Career and Technical Education (CTE) Vocational Fair
Visit the career and technical education facilities at Somerville High School Saturday to meet teachers, see demonstrations, and learn about CTE's 13 different programs, which prepare students for careers in the Boston region. It's from 9 a.m. to 12 p.m. at the Somerville High School atrium.

The Fiddlers of Inishbofin
Here's a description of the performance, which features an all-Irish cast: "The Fiddlers of Inishbofin are a group of Ireland's finest musicians who gather and travel to musical sessions. When the group travels to the picturesque isle of Inishbofin, to celebrate a fellow fiddler's birthday, sparks begin to fly between the two most accomplished and competitive fiddlers, Fiona and Liam." Check it out at The Burren Saturday at 6:30 p.m.

'Humor from My Pen'
Discover the political cartoons of Gerardo Hernández, a Cuban prisoner in the United States. The exhibit is on display at The Center for Arts at the Armory Saturday from 9:30 a.m. to 2:30 p.m.

All Things Horror presents THE BATTERY
The listing says, "Two ex-ballplayers band together after a zombie breakout wipes out the vast majority of the population. Like a modern day Odd Couple, the pair find themselves at constant odds at how to proceed." It screens at Somerville Theatre Saturday at 8 p.m.

Theatre@First Presents Lysistrata
In Aristophanes' comedy, the women of Ancient Greece vow not to have sex with men until peace is declared. See it Saturday at Unity Somerville at 2 p.m.

St. Patrick's Day
Sunday is St. Patrick's Day. Here are 10 ways to celebrate in Somerville.