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Aggregation No. 1A night of psychedelic blues at 8 p.m. Friday at Lilypad, 1353 Cambridge St., Inman Square. Admission is $10 at the door.

Arts presenter the Psychedelic Lens offers a double-bill of artists who mix classical and experimental ideals with folk and popular traditions to create original work. The 13 O’Clock Blues Band (Jon Catler on vocals, 64-tone just intonation guitar and 12-tone ultra-plus guitar; Babe Borden on vocals and keyboards; Ed Broms on 12-tone ultra plus bass and fretless bass; and Benny Benson on drums) puts Delta blues through a psychedelic lens. Loop 2.4.3 is a collaboration of New Haven pianist and composer Istvan Peter B’Racz and Bostonians Jon Catlerand and Meredith Borden performing material from their upcoming fourth album of music. The band has credited with making “brand-new yet iconic sounds that create a riveting aura, a genuine time-warp,” by Gramophone. Information is here.

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Aggregation No. 2Dance for World Community Festival from noon to 8 p.m. Saturday at The Sanctuary Theatre, 400 Harvard St., and on Massachusetts Avenue in Harvard Square. Free.

The Jose Mateo Ballet Theatre’s seventh annual Dance for World Community Festival encompasses more than 80 performances in pretty much any style you can imagine – including African, ballet, folk, hip-hop, Irish step, modern and salsa – on four outdoor and one indoor stage, culminating in a Dancing in the Streets party at 6 p.m. Along with the six hours of dance performances and classes there will be kids’ activities and food, all to showcase dance “as a powerful force in bringing people together to work and celebrate for a better world.” Information is here and here.

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Aggregation No. 3Somerville Squeezebox Slam from noon to 6 p.m. Saturday (starting around Somerville, leading to Seven Hills Park, Davis Square, Somerville at 3 p.m.). Free.

This celebration of accordions, button boxes and other free-standing reed instruments heads into its fourth year, with accordionists of all skill levels and musical genres strolling the neighborhoods of Somerville and, pied-piper style, bringing crowds to Davis Square for a concert of some of New England’s finest players. The Big Stroll takes place from noon to 3 p.m., leading to “The Big Squeeze” launch by Lady Kielbasia – voted Best Drag Queen with an Accordion in San Francisco and a Provincetown Family Favorite who has retired to Somerville. The schedule includes Ralph Tufo and the Squeezebox Stompers at 3:15 p.m.; Sonny Barbato at 3:45 p.m.; a tribute to Evan Harlan by Cassan and McLaughlin at 4:15 p.m.; Balkan Fields featuring Melinda Fields at 4:30 p.m.; and Jinta-la-Mvta featuring Marié Abe at 5 p.m. Accordion-themed art and crafts will be for sale as well. Information is here.

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Aggregation No. 4Revels Fringe presents Sam Amidon and Maeve Gilchrist from 7 to 9:30 p.m. Sunday at The Center for Arts at the Armory, 191 Highland Ave., Somerville. Tickets are $35 for general admission, or $20 for people 35 and under.

Revels Fringe, aimed at “exploring the unpredictable edge of the folk process,” puts Vermont-based singer and fiddler Sam Amidon onstage with Scots harpist and singer Maeve Gilchrist. Half of the program is dedicated to traditional roots and the other half to that unpredictable edge. Information is here.

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Aggregation No. 5Bizarro Ball of burlesque at 8 p.m. Sunday at Oberon, 2 Arrow St., Harvard Square. Tickets are $15 to stand or $20 for a table.

This night of “awesomely weird and outside-the-box” burlesque, games, contests and prizes – along with custom cocktails and photo on the red carpet – benefits Alterna-Tease: The New England Neo-Burlesque Festival. Burlesque dancers include Dinah Deville, Sugar Dish, Honey Pie, Lolli Hoops, Femme Brulée, Jane Doe, Allix Mortis, Dewie Decimator, Jolie LaVie, Claude Kitten and Siren of the Circle; go-go dancers include Kid Vicious, Maggie Maraschino and Johnny Bendovah; and games will be hosted by Anne Frankenstein. Information is here.