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Aggregation No. 1“Comedy, America!” at 10 p.m. Friday and Saturday and 8 p.m. Sunday at ImprovBoston, 40 Prospect St., Central Square. Tickets are $18.

Choose a weekend to celebrate the nation’s independence and watch your entertainment options dry up. Fortunately, ImprovBoston is bringing back its original sketch and musical revue, “Comedy, America!” for a third year, and for three shows – a good thing, since its premiere year (credited with “chemistry, dynamism and fun-loving energy” in the Lynn Journal) sold out, and so did last year’s version. Billed as equal parts satire and celebration, the show is led by Allen McRae and Kevin Quigley, who say their “intent is to create a show as awesome, absurd, smart and idiotic as the actual good old US of A.” If the show sells out or the price of entry is too steep, grab a seat at the 11:30 p.m. “Nightcap” standup show for free; the 11:30 p.m. Saturday “LaughterRisk*” show for $5; or the pay-what-you-can standup event “The People’s Show” ($10 is suggested) at 9 p.m. Sunday. Information is here.

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Aggregation No. 2Air Guitar Championships at 7 p.m. Saturday at The Middle East Upstairs, 472 Massachusetts Ave., Central Square. Tickets are $15.

Boston’s best fake guitarists battle it out for a chance at real glory – winners will be flown to Austin, Texas, to compete in the U.S. Air Guitar National Finals on Aug. 6, and the U.S. champ will then be sent to Oulu, Finland, to represent the country in the world championships. The night is hosted by Doug “The Thunder” Stroock, whom everyone will remember as being ranked the second-best air guitarist in the world in 2013, and he’s not the only air guitar heroes coming to town; organizers say some of the best from all over country will be flying in to put on “once-in-a-lifetime face-melting special performances.” Information is here.

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Aggregation No. 3“Forge and Strike: the Art of Weaponry” opening reception from 8 to 10 p.m. Saturday at Eridanos Tattoo and Piercing art gallery, 36 Prospect St., Central Square. Free.

The “Forge and Strike” curated show of artist-made weaponry can be visited at this gothy tattoo parlor through Aug. 5, but this is the night to see the works – interpreted from the darkest corners of horror and fantasy, as well as tools of war recreated from our bloody history – and meet some of the nearly two dozen modern blacksmiths making them. The exhibit shows “what weaponry means to them through metal forgery and organic matter,” organizers say. Refreshments will be provided. Information is here.

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Aggregation No. 4Summer BCMFest from 2:30 to 5 p.m. Sunday on Palmer Street, Harvard Square. Free.

This isn’t as big a deal as the winter version of BCMFest, which bring in more than 100 performers over the course of a weekend to celebrate Irish, Scottish, Cape Breton and other Celtic music. But there’s still two and a half hours of free entertainment from the Boston University Step About Boston Celtic Dancers; Armand Aromin and Dan Accardi from the band The Ivy Leaf; and Soulsha, a local band combining Scottish and West African traditional music with funk, highlife and afrobeat. After a break, there’s a 7 p.m. show with The Coyne Family, Owen Marshall and Mariel Vandersteel for $18. Information about the free event is here.

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Aggregation No. 5Live jazz with Samuel Batista from 6 to 8 p.m. Monday in the courtyard of Regattabar at The Charles Hotel, 1 Bennett St., Harvard Square. Free.

Panamanian alto saxophone player Samuel Batista, Berklee-ite and bandleader of the Third Land Quintet – now recording its first EP – has played with such musicians as John Patitucci, Joe Lovano and Ron Savage, and Harvard Square’s legendary Reggatabar has chosen him for this free appearance under the sun, surrounded by opportunities for outdoor dining from Legal Sea Food, Henrietta’s Table, Charlie’s Kitchen and more. Information is here.