WHAT Gallery hopping in Huntington: "Umbra," a photographic series by Joan Powers, opens with a reception and book signing Saturday. Photos in the show invite the observer to take a closer look. Is the sun emerging from the cloud or disappearing behind it? "I use a low-tech plastic camera," Powers says, "sometimes exposing four or five times for one image." The intense black and deep grays give the images "the mysterious, foreboding nature I seek," she says. Powers' eponymous book includes 160 color and black-and-white images. Around the corner, you can drop by "Expo 30," winning entries in b.j. spoke gallery's annual international competition, juried by Maura Lynch, a Museum of Modern Art curator. Artists from across the country are represented, including Stephanie Navon of North Bellmore, Alice Plusch of Huntington and Marta Stockwell of Brooklyn. Down the street, you can take in "Portrait," a group show of portraiture juried by artist Suzanne Young, who teaches at the Art League of Long Island.
WHEN | WHERE "Umbra" reception 5 to 7 p.m. Saturday at fotofoto gallery, 372 New York Ave., gallery hours: noon to 4 p.m. Sundays, 5 to 8 p.m. Fridays, noon to 8 p.m. Saturdays, through April 17; "Expo 30," 11 a.m. to 5 p.m. weekends and Tuesdays to Thursdays, 11 a.m. to 9 p.m. Fridays at b.j. spoke gallery, 299 Main St., through March 29; "Portrait," 9 a.m. to 5 p.m. Mondays through Fridays at Main Street Petite Gallery, Huntington Arts Council, 213 Main St., through April 22
INFO Free: fotofotogallery.com, 631-549-0448; bjspokegallery.com, 631-549-5106; huntingtonarts.org, 631-271-8423 -- steve parks
WHAT "The Mousetrap" is one of the major reasons Agatha Christie got a Dame in front of her name. At 58 years and more than 24,000 performances, it's the longest-running play in modern theater history. The Dame Agatha formula was established in "Mousetrap." One of five guests at a small hotel is murdered during a blizzard. When the police sergeant arrives on skis, his job is to figure out -- you got it -- whodunit. Management warns that any patron who reveals the identity of the killer to anyone outside the theater will be subject to the Christie Curse.
WHEN | WHERE Saturday and Thursday nights at 8, Sunday at 2 p.m., through April 10, at Smithtown Center for the Performing Arts, 2 E. Main St.
INFO $16 to $30; smithtown pac.org, 631-724-3700
WHAT The Islip Arts Council's free winter concert series continues with Flying Forms, a chamber duo from Minnesota playing on period instruments. Baroque violinist Marc Levine and harpsichordist Tami Morse will be joined by guest lutenist Christopher Morrongiello in a program of Bach, Handel, Corelli and more. The intimate setting is appropriate for the unamplified historic instruments.
WHEN | WHERE 2 p.m. Sunday at the Bayard Arboretum Carriage House, Great River
INFO Free (tickets distributed starting at 12:30 p.m., seating at 1:45); islipartscouncil.org, 631-224-5420