Ladyfest Boston 2017 from 5 to 11 p.m. Friday, noon to 11 p.m. Saturday and 11 a.m. to 9 p.m. Sunday at Cambridge YMCA Theatre, 820 Massachusetts Ave., Central Square. Day passes are $15 and three-day passes are $35 (or $37.22 with the online service fee).

This is the 17th annual DIY, community-based and volunteer-run festival highlighting underrepresented creators in arts and music communities around the world. There are discussions, workshops, panels and a flea market, but the biggest aspect of this event – which fundraises this year for Girls Rock Campaign Boston and Rosies Place – is the performances. Nearly two dozen bands (Amanda X is above) perform across all three days and a variety of genres. Information is here.

“No Exit” by Jean-Paul Sartre at 7:30 p.m. Friday and Saturday and 2 p.m. Sunday at The Space Studio, 438 Somerville Ave., in Somerville’s Ward 2 neighborhood. (Performances continue through April 30.) Enter in the alley between Market Basket and the Little India Market. Tickets are $20.

In Jean-Paul Sartre’s classic 1944 play, three damned souls are trapped and forced to discover the true nature of hell. Spoiler alert: It’s other people. Paul Bowles did the adaptation and Exiled Theatre’s Katharine Jordan directs a play that’s been on U.S. stages since 1946, an essential checkbox of cultural literacy. (Meaning that if you see it, you get to go to parties and talk about it with people you want to impress). It’s also the first theatrical use of The Space Studio, typically used for film and photography. Information is here.

Spring Family Fun Day from 1 to 3 p.m. Saturday at the The Harvard Coop, 1400 Massachusetts Ave., Harvard Square. A $3.80 ticket ($5 with online fees) is needed for each child attending; adults don’t need tickets.

There’s a scavenger hunt, Earth-friendly crafts and other outdoor activities at this event, but the standout part of the day might be the baby animal petting zoo put on by the family-run Blazing Saddles Pony Parties of Dartmouth. Information is here.

The Down Home Up Here Bluegrass Festival from 4 to 11 p.m. Saturday and Sunday at Passim, 47 Palmer St., Harvard Square. Daily tickets are $15 (or $18.65 with the online service fee).

This annual Down Home Up Here Bluegrass Festival returns to the Passim stage with 14 bands. “Folk music has been an integral part of many social and political movements in history, and it continues to stay at the heart of American culture. Bluegrass holds a similar place in Americana, and we hope to keep it alive and growing,” participants Mamma’s Marmalade told Red Line Roots’ Brian Carroll last year. Information and the lineup for this year’s event is here.

The Technoskeptic Goes to the Movies: “Gattaca” at 7 p.m. Saturday at The Brattle Theatre, 40 Brattle St., Harvard Square. Tickets are $12.

Andrew Niccol’s stylish futuristic thriller “Gattaca” hit theaters in 1997, raising deep hypothetical questions about genetic supremacy that made for enjoyable parlor conversation. Two decades later, with Crispr gene-editing technique, mitochondrial donation and other advances, the questions are no longer hypothetical. The Technoskeptic, a locally based online magazine, screens the film and presents a discussion of the real science that has dramatically upped the ethical stakes, with Technoskeptic founder and publisher Mo Lotman talking with George Annas, director of the Center for Health Law, Ethics & Human Rights at Boston University, and Antonio Regalado, the senior biomedicine editor for the MIT Technology Review. Information is here.