11 a.m. Saturday, Free Library of Philadelphia Central Branch, 1901 Vine St., free, 215-569-8080.
Chamber music - it's not for adults anymore! The sensational conductorless string ensemble ECCO presents a free family concert, with not much different from their sold-out Friday night Philadelphia Chamber Music Society gig for adults at the Kimmel Center - except the 17 musicians will be interactive (i.e., they'll talk and answer questions about how they play). The program is the same: Mozart, Elgar, Britten, and Jalbert. - Michael Harrington
Best of the Fest: Kid Flix Mix Part 2
2 p.m. Saturday, International House, 3701 Chestnut St., $5, 215-387-5125.
The Best of the Fest: Kid Flix Mix Part 2 features selections from the New York International Children's Film Festival for ages 9 and up. Highlights include: Alexandra Hetmerová's Mythopolis, an animated tale of a little minotaur, his medusa mom, and a cyclops delivery guy living in a modern city neighborhood; Kyungmin Woo's Johnny Express, about a lazy space delivery man; and Chloé Alliez's stop-motion masterpiece Oh My Dog, in which a variety of canines demonstrate their talents (yes, there is pooping - but it's very tasteful, really). - M.H.
Tarantulas: Alive and Up Close
Through May 30, Academy of Natural Sciences, 1900 Benjamin Franklin Pkwy, $18.95-22.95, 215-299-1000.
Time is running short to be creeped out - or charmed, if that's your thing - by the exhibit "Tarantulas: Alive and Up Close." Any ol' spider can make your skin crawl - but tarantulas are bigger, hairier, faster, and meaner than just about any other arachnid (hey, one took on 007 in Dr. No). This exhibit offers interactive opportunities to learn about, observe, and even dress up as the eight-legged wonders. Want to learn more? Here are 4 things we learned at "Tarantulas: Alive and Up Close." - M.H.
The Pirates of Penzance
8 p.m. Friday; 2 & 8 p.m., Saturday, Suzanne Roberts Theatre, 480 S. Broad St. $45, 215-735-7161.
Gilbert and Sullivan's The Pirates of Penzance is the very model of a classic comic opera. It's the story of an apprentice buccaneer who finds his love for a major-general's daughter complicated by the leap year . . . yeah, this Savoy Company production is grandly, gloriously silly, and great fun. - M.H.
20th Annual Home & Garden Festival in Chestnut Hill
11 a.m.-5 p.m. Sunday, Germantown Avenue from Rex to Willow Grove Avenues, free, 215-247-6696.
April showers delayed the 20th Annual Home & Garden Festival in Chestnut Hill, but as always, the sun will shine. The popular event features more than 150 vendors, artists, and craftsmen lining Germantown Avenue. There's also music with the City Rhythm Orchestra, the Classic Rockers, the Dukes of Destiny, and Midnight Shift, plus rides, face painting, a basketball clinic, petting zoo, Harry Potter garden, and a maypole dance. - M.H.
Hawthornes IPA Block Party
1-8 p.m., Saturday, Hawthornes Beer Cafe, 738 S. 11th St., pay as you go, 215-627-3012,
Drink a beer at a block party that even Fido and Junior will enjoy. Hawthornes Beer Cafe hosts its seventh annual shindig, with a new area dedicated just to kids (including a giant slide). A host of beers - including the Russian River Pliny the Elder and other rarities - go for only $5 each, and homemade food will be cooked up by the staff of the quaint restaurant. - Molly Eichel
Ferris Bueller's Day Off
2 and 7 p.m. Sunday and Wednesday. Find your local theater at fathomevents.com.
Hard to believe, but Ferris Bueller's Day Off is celebrating a 30th anniversary. Yes, the silver screen's most famous malingerer would be 47 now and maybe the dad of slick schemer of his own. (Hey, somebody should make that movie - we think Matthew Broderick is available.) John Hughes' 1986 classic hits the big screens again. - M.H.
5 p.m. Saturday, Bourbon & Branch, 705 N. Second St., free.
Former Mae Pang bassist Christine Weiser is a novelist now, but that doesn't mean she can't get the band back together to celebrate her new book. Come As You Are (PS Books), a sequel to her debut, is about an all-girl rock trio reuniting after a decade (hey, they say write what you know). Come for a reading and performance. - M.H.
Through Sunday, Philadelphia Museum of Art, 26th Street and the Parkway, adults, $20; seniors (65 and up), $18; students and youths (13-18), $14; children, free, 215-763-8100.
The critically acclaimed International Pop ends its run this week. Our own Thomas Hine called the show "eye-popping, as well as mind-expanding." While you're at the Philadelphia Museum of Art, check out "Creative Africa," featuring various works in different media, at the Perelman Building. - M.E.
The Punk Rock Flea Market
10 a.m. Saturday & Sunday, Punk Rock Flea Market Dome, 461 N. Ninth St., $3 donation, 215-821-7575.
From rare records to giant stone busts of Elvis (which we may or may not have bought for $10 last time around), the Punk Rock Flea Market has it all. There will be 500 vendors over two days. Hop across the street for the Philadelphia Record Riot, where 50 sellers have every genre under the big, black sun. - M.E.
Aberdeen Dad Vail Regatta
Friday & Saturday. Race course starts at the Kelly Drive-Hunting Park Avenue intersection and ends at the Grand Stand above the Columbia Avenue Bridge, free.
Rowers from all over descend on the Schuylkill for the largest collegiate regatta in the country. Stand by and root for one of 125 teams competing for glory in the Olympic-size course. The best place to watch? The Grand Stand. - M.E.
With Thomas Bazzanella, 8 p.m. Wednesday at the Tin Angel, 20 S. Second St. $18. 215-928-0770.
On "Whose Heart You Wreck (Ode to the Muse)" from his most recent album, Radney Foster laments the capricious nature of artistic inspiration, and the toll it takes: "Sometimes you kiss me, baby, sometimes you don't. . . ." Throughout the album, Everything I Should Have Said, the results of Foster's labor sure sound effortless - as has most of the work the Nashville singer-songwriter has produced over his career, whether on his own or with fellow pop classicist Bill Lloyd in the duo Foster & Lloyd. Foster writes taut songs brimming with craft and hooks, and the occasional country touch. They also are invariably true to life without being arty or affected. - Nick Cristiano
Old 97's / Heartless Bastards
With BJ Barham, 8:30 p.m. Saturday at Union Transfer, 1026 Spring Garden St. $25. 215-232-2100.
Although this co-headlining bill could appear to be a throwback to the halcyon days of alt-country, both the Old 97's and Heartless Bastards are touring behind their loudest, strongest albums in years. Ohio's Bastards rocked out with the fervor of Crazy Horse on last year's Restless Ones. The riffs may not be as indelible as on the best of Stairs and Elevators, their 2005 debut, but Erika Wennerstrom's voice is still a howling force.
The Old 97's used their 10th album, 2014's Most Messed Up, to look back at their journey from Texas alt-country upstarts in the early 1990s. "We've been doing this longer than you've been alive / propelled by some mysterious drive," Rhett Miller sings. And that drive continues: Their 11th is on the way. - Steve Klinge
Yeasayer / Young Magic
8:30 p.m. Tuesday at Union Transfer, 1026 Spring Garden St. $25. 215-232-2100.
In celebrating its 10th anniversary of being Brooklyn's best exponent of pop-folk-electro-psychedelia, the messy collective Yeasayer slickly revitalizes its sound on its new, fourth studio album (and first for the Mute label) Amen & Goodbye. At the same time, the band maintains its stance as the indie solar system's top collagists, as shown on its best-known work, 2010's dub-dance Odd Blood.
Neither is an easy feat. Yet, Baltimore-born, onetime barbershop harmonists Chris Keating and Anand Wilder (Yea's originators and, respectively, its keyboardist and guitarist) have found many ways into a brave new/old world. Amen & Goodbye features short, skittish tracks such as the aptly titled "Computer Canticle I," the rhythmically complex "Divine Simulacrum," the epically quirky (and quirkily epic) and well-rounded "I Am Chemistry" and the Beatlesy ballad "Uma."
Get to Union Transfer early to see collage-pop artists Melati Malay, a Jakarta-born Indonesian-American vocalist, and Sydney-born songwriter-producer Isaac Emmanuel, together known as Young Magic. Their debut album Melt sounds really young and altogether magical. - A.D. Amorosi
8 p.m. Friday, Art Alliance, 251 S. 18th St., $20.
For her dynamite new album, Otis Was a Polar Bear, the inventive drummer and composer Allison Miller was inspired by the birth of her child and the children's songs she sang to her daughter. That doesn't mean the tunes don't take some dips in the free-bop groove. She plays with the sextet Boom Tic Boom. - M.H.