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Aggregation No. 1Harvard Summer Chorus Concert from 8 to 10 p.m. Friday and Harvard Summer School Orchestra Concert from 8 to 10 p.m. Saturday at Sanders Theatre, 45 Quincy St., near Harvard Square. Free.

The Harvard Summer Chorus performs Ross Lee Finney’s “Pilgrim Psalms” and premieres Carson Cooman’s “Rain Songs,” while the Harvard Summer School Orchestra presents its 31st annual concert under the direction of Judith Zuckerman with Faure’s “Pavane,” Berlioz’s “Les Nuits d’été” (with mezzo-soprano Letitia Stevens) and Rossini’s “Overture to L’Italian in Algeri,” as well as selections form Bizet’s “Carmen Suites” – both in the gorgeous Sanders Theatre  and free – on consecutive nights. Information about the chorus concert is here and about the orchestra concert is here.

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Aggregation No. 2Org: Black and White Ball at 8 p.m. Friday at Oberon, 2 Arrow St., Harvard Square. Tickets are $15 to $20.

The 42nd of these multimedia, multi-act performance party and variety shows known as Orgs (all produced and curated by Mali Sastri, of Boston avant-art rock band Jaggery) is a Black & White Ball, which encourages audience members to wear black and white while taking in art that explores contrasts, opposites and extremes – including music by Jaggery and Faun Fables of Oakland, performance by Luminarium Dance and Kristilyn Stevenson and many more. Information is here.

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Aggregation No. 3Games, a rummage sale and music festival for and about girls and women on Saturday and Sunday in Cambridge and Somerville. Free or $12 as below.

The ELS Game Day from noon to 6 p.m. Saturday at Pandemonium Books & Games, 4 Pleasant St., Central Square, offers card games, board games and role-playing games for women and girls of all ages only, inspired by (and taking its acronym from) aviator Amelia Earhart, mathematician Ada Lovelace and author Mary Shelley. Free, with information here.

The Recycle for Rock to Benefit GRCB from 6:30 p.m. Saturday to 12:30 a.m. Sunday at Once Lounge + Ballroom, 156 Highland Ave., Somerville, is a sale of records, CDs, books and other gently used items for all to benefit the Girls Rock Campaign Boston that includes the Cover for Your Friends Fest of bands – including The Knock Ups, Psychic Dog, Mercury on Mars, Thrust Club and Rrrright? – as well as comedy, vendors and a photo booth. Tickets are $12, with information here. (There’s also a GRCB Kickball Classic at the Conway Park baseball field, 550 Somerville Ave., in the Spring Hill neighborhood of Somerville, where individuals and teams will compete from noon onward for $25 to $150 entry fees going to the girls’ rock organization. Information is here.)

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Aggregation No. 4Port Sounds Music & Comedy Fest from 6 to 11 p.m. Saturday at Gallery 263, 263 Pearl St., Cambridgeport. Tickets are $15.

This one-night festival (adding comedians in its second year) sponsored by Aeronaut Brewing is headlined by Ruby Rose Fox – winner of last year’s Boston Music Awards’ Best Female Vocalist and Best Pop Artist awards – and backup singers The Steinems. Additional performances are from singer-songwriter Maggie Whitlock, acoustic gospel-, blues- and jazz-tinged trio The By & By and a showcase of comedians and storytellers hosted by Nick Ortolani that includes Pamela Ross, Mike LemmeWes Hazard and Chris Post. Information is here.

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072816i Timothy J. Fuss Russell MaloneAggregation No. 5Cambridge Jazz Festival from noon to 6 p.m. Sunday at Danehy Park, 99 Sherman St., in the Avon Hill neighborhood just east of Fresh Pond. Free open seating tickets and $20 guaranteed seating tickets are here.

The third annual Cambridge Jazz Festival is hosted by Eric Jackson, of WGBH’s Jazz 24/7, and headlined by saxophonist Walter Beasley. Also performing are Russell Malone; Bill Pierce; the Ron Savage Trio; Nadia Washington; the Rebecca Cline Trio; and the Afro Latin Blend Ensemble. Information is here.