Blue Sky Puppet Theatre The touring children’s theater group performs. 10:30 a.m. Gaithersburg City Hall, Concert Pavilion, 31 S. Summit Ave., Gaithersburg. 301-258-6350. www.gaithersburgmd.gov. Free.
National Youth Orchestra of Canada The orchestra presents music by Dvorak and Shostakovich, plus “Terra Incognita,” a new work by Canadian composer Adam Sherkin. 7 p.m. Music Center at Strathmore, 5301 Tuckerman Lane, North Bethesda. 301-581-5100. www.strathmore.org. Free.
“Spaceballs” AFI Silver screens Mel Brooks’s 1987 classic spoof of “Star Wars.” 9:30 p.m. AFI Silver Theatre, 8633 Colesville Rd., Silver Spring. 301-495-6720. www.afi.com/silver. $11.50, seniors $9, age 12 and younger $7.
“Little Shop of Horrors” A mysterious plant with a hunger for human flesh helps a shy young man win over his crush in the musical by Alan Menken and Howard Ashman, presented by the Olney Theatre Center. Continues Thursday-Friday at 8 p.m., Saturday at 2 and 8 p.m., Sunday at 2 and 7:30 p.m., Tuesday at 7:30 p.m., Wednesday at 8 p.m. Through Aug. 26. Olney Theatre Center, 2001 Olney-Sandy Spring Rd., Olney. 301-924-3400. www.olneytheatre.org. $26-$54.
National Small Works The 15th annual juried showcase of prints smaller than 170 square inches contains 50 prints by 42 artists from across the country. Through Aug. 26. Pyramid Atlantic Art Center, 8230 Georgia Ave., Silver Spring. 301-608-9101. www.pyramidatlanticartcenter.org. Free.
Montgomery County Fair Animal exhibits, music, magic shows, pig races, carnival rides, demolition derby, monster trucks, camel rides, contests and more. Opens Friday, continues Saturday-Wednesday 10 a.m.-midnight. Through Aug. 18. Montgomery County Fairgrounds, 16 Chestnut St., Gaithersburg. 301-963-3247. 301-963-3247. www.mcagfair.com. $10 (does not include ride tickets), age 11 and younger free; passes available.
The Rayvns Rockville’s Friday Night Live series continues with a reunion concert by the Baltimore rock band 30 years after their hit song “Raised on the Radio” was featured in the film “Fast Times at Ridgemont High.” 6:30 p.m. Rockville Town Square, between Rockville Pike, East Middle Lane, North Washington Street and Beall Avenue, Rockville. www.rockvilletownsquare.com. Free.
Soul Crackers The Maryland band plays Memphis and Motown soul as part of the Downtown Wheaton TGIF Summer Concert Series. 6:30 p.m. Wheaton Triangle, Grandview Avenue and Reedie Drive, Wheaton. 240-777-8106. www.wheatonmd.org. Free.
“Afterplay” and “A Little Trick” Two of Chekhov’s popular characters meet in a cafe in Brian Friel’s “Afterplay,” and one of his short stories, “A Little Trick,” is given a twist as a memory play. Both are presented by Quotidian Theatre Company. Continues Friday-Saturday at 8 p.m. and Sunday at 2 p.m. Through Aug. 19. The Writer’s Center, 4508 Walsh St., Bethesda. 301-654-8664. www.writer.org. $25, seniors and students $20.
VisArts exhibits “Mnemonic Fragmentation,” Mei Mei Chang’s organic, site-specific installation of painting and drawing, and “_____ scape,” a group show of 11 artists’ paintings, drawings and photographs, close Friday. VisArts at Rockville, 155 Gibbs St., Rockville. 301-315-8200. www.visartscenter.org. Free.
“If You Give a Moose a Muffin” Adventure Theatre Musical Theater Center presents a children’s play based on Laura Numeroff’s book, the sequel to “If You Give a Mouse a Cookie.” Saturday-Sunday at 11 a.m., 2 and 4:30 p.m., Monday at 10:30 a.m. Through Sept. 2. Glen Echo Park, Adventure Theatre MTC, 7300 MacArthur Blvd., Glen Echo. 301-634-2270. www.adventuretheatre.org. $18.
FestAfrica A weekend-long festival to promote tourism and community service in Africa features local and international African music and dance groups, African cuisine, children’s games, vendors and information about health, careers and vacation destinations. Highlights include Toby Foyeh & Orchestra Africa; Navasha Daya and Rafiya (Saturday); and Diblo Dibala, Lenny Kurlou and Ishangi Legacy (Sunday). Saturday-Sunday at 1-8 p.m. Veterans Plaza, 1 Veterans Pl., Silver Spring. 410-608-0420. www.festafricausa.com. Free.
“Wake Up, Brother Bear” Two bear siblings explore the seasons and invite the audience to come along. Tots are given a bag of props at the beginning of each show that will help tell the story. Saturday-Sunday at 10:30 and 11:45 a.m. Closes Sunday. Imagination Stage, 4908 Auburn Ave., Bethesda. 301-280-1660. www.imaginationstage.org. $10.
“The Dumb Waiter” and “Trifles” Unexpected Stage mounts Harold Pinter’s “The Dumb Waiter” and Susan Glaspell’s “Trifles,” a pair of suspenseful playlets with different views on murderous instincts. Friday at 7:30 p.m., Saturday-Sunday at 2 and 7:30 p.m. Closes Sunday. Randolph Road Theatre, 4010 Randolph Rd., Silver Spring. 301-337-8290. 240-777-6820. www.unexpectedstage.org. $10-$25, seniors $8-$23, student rush tickets $8.
Opera International: “Lucia di Lammermoor” Soprano Jessica Stecklein, tenor Yingxi Zhang and baritone Daesan No star in a semi-staged production of Donizetti’s opera with surpertitles. 4 p.m. Music Center at Strathmore, 5301 Tuckerman Lane, North Bethesda. 301-581-5100. www.strathmore.org. $20-$50.
Group show Joseph Sheppard, Nina Akamu, Joan Bontempo, Jane DeDecker and Kimberly Seibert exhibit their sculptures. Through Aug. 31. Marin-Price Galleries, 7022 Wisconsin Ave., Chevy Chase. 301-718-0622. www.marin-pricegalleries.com. Free.
Silly Bus The band plays some of its award-winning originals and traditional children’s songs. 6:30 p.m. Rockville Town Square, between Rockville Pike, East Middle Lane, North Washington Street and Beall Avenue, Rockville. www.rockvilletownsquare.com.
John Henry England The guitarist performs original and traditional children’s songs. 6 p.m. Downtown Silver Spring, Plaza Stage, on and around Ellsworth Drive, Georgia Avenue and Fenton Street, Silver Spring. www.downtownsilverspring.com. Free.
UkeFest 2012 Part of Strathmore’s free summer concert series, the Hawaiian-themed event features Hula Honeys, Keola, Moanalani Beamer, Cathy Fink and Marcy Marxer. Wednesday at 7 p.m. Mansion at Strathmore, 10701 Rockville Pike, North Bethesda. 301-581-5100. www.strathmore.org. Free.
“The Last Lions” Rockville’s summer outdoor film series continues with the 2011 documentary about vanishing big cats by the Botswanan husband-and-wife team of Dereck and Beverly Joubert. 8:45 p.m. Rockville Town Square, between Rockville Pike, East Middle Lane, North Washington Street and Beall Avenue, Rockville. 301-998-8178. www.rockvilletownsquare.com. Free.
— Compiled by Carrie Donovan from staff reports