Find something truly unpredictable at the Pittsburgh Fringe Festival, connect with the outside at Carnegie Museum of Natural History’s NatureFest or check out Gilbert & Sullivan’s ‘The Grand Duke’ — here’s what to do in Pittsburgh this weekend.

Theater
Pittsburgh Fringe is arguably the city’s busiest and most unpredictable annual theater festival. Starting Thu., March 19, the Fringe returns for its 13th year with 50 unique events ranging from stand-up comedy, clowning, and live music to dance, live podcasts and puppetry, by artists from Pittsburgh, around the U.S. and even overseas. The shows — from the wacky to the contemplative — take place mostly in venues along Penn Avenue in Bloomfield and Garfield, though satellite events are set for Lawrenceville, East Liberty and elsewhere. The Fringe runs through March 28.

Theater
Gilbert & Sullivan’s “The Grand Duke” was their final composition as a duo, and Pittsburgh Savoyard’s new production concludes its own season. The 1896 musical comedy depicts a scrappy theatrical troupe conspiring to unseat a hated Grand Duke in 1750 amidst a whirl of secret signals, matrimonial hijinks, mistaken identities and, of course, comic songs. There are six performances this weekend and next starting Fri., March 20, at the Andrew Carnegie Free Library & Music Hall, in Carnegie.

Dance
Texture Contemporary Ballet wraps its 15th season with “Eternal Beauty” at the New Hazlett Theater. The program of new works includes “Architecture of the Soul,” by resident choreographer Madeline Kendall Schreiber, “Woman,” by guest choreographer Alexandra Tiso, and “Moment of Impact,” by Texture founder and artistic director Alan Obuzor. There are three performances Fri., March 20, through Sun., March 22, plus an interactive children’s performance Sat., March 21.

Festival
The Carnegie Museum of Natural History hosts its second annual NatureFest. The full day of family-friendly activities includes programs on dinosaur sounds and frog calls, a dance performance by the Council of Three Rivers American Indian Center, yoga sessions, visits to the Visible Conservation Lab and more, all on Sat., March 21 (the first full day of spring). Tickets are included with the price of museum admission.

Film
Veteran local filmmakers Betsy and Joe Seamans present four of their short documentaries from over the decades. The Sat., March 21, program at the Harris Theater titled Abide in This Place for a While includes “Conversations in Rhyme” (1979), about children’s folk traditions from Pittsburgh; “The Journey is This” (’09), about local artist Tim Kaulen; “You’ve Got to Take Pride in What You Do” (‘’16) about Tennessee logger and mule trainer Jeff James; and one new film, “An Alternate Reality,” about local comics maven Bill Boichel and his store Copacetic Comics. A Q&A follows.