8 pm: Theater

Following up its hit stage show “A Midsummer Saturday Night’s Fever Dream,” Troubadour Theater Company presents its latest Shakespearean romp, “Romeo Hall & Juliet Oates,” turning the romantic tragedy into a commedia dell’arte-style fairy tale set to the 1980s rock ‘n’ roll music of Hall & Oates.

* “Romeo Hall & Juliet Oates,” John Anson Ford Amphitheatre, 2580 Cahuenga Blvd. East, Hollywood. Fridays-Saturdays, 8 p.m. Ends June 9. $25. (323) 461-3673.

all day: Exhibition

The Hollywood Entertainment Museum will celebrate what would have been Marilyn Monroe’s 75th birthday with an exhibit featuring rarely seen memorabilia connected to the late sex symbol and film icon. The pink dress she wore in the 1960 movie “Let’s Make Love,” a wedding photo from her first marriage, in 1942 at the age of 16, and a short, white terry-cloth bathrobe worn in George Barris’ famous beach photo in 1961 are highlights of the “Happy Birthday, Marilyn” exhibit. The collection includes more than 200 artifacts, costumes, art and photography representing the Monroe persona.

* “Happy Birthday, Marilyn,” Hollywood Entertainment Museum, 7021 Hollywood Blvd., Los Angeles. Friday through Aug. 15. Daily, 10 a.m.-6 p.m. Museum admission: $7.50; seniors and students, $4.50; ages 5-12, $4; under age 5, free. (323) 960-4833.

7:30 pm: Pop Music

More and more, it seems writers who want to describe the excesses, cliches and absurdities of your classic ‘70s-vintage hard-rock world are reduced to just two words: Spinal Tap. The titular subject of Rob Reiner’s 1984 “mockumentary,” the hapless headbangers have endured beyond the screen, and fiction turns flesh once again as the quartet headlines the Greek Theatre.

* Spinal Tap, with the Folksmen, Greek Theatre, 2700 Vermont Canyon Road, L.A. 7:30 p.m. $25 to $58.50. (213) 480-3232.

8 pm: Pop Music

David Byrne is trying to show there’s life long after Talking Heads, and Joe Henry is still knocking on the door with his latest critically acclaimed album in hand. Regardless of their status on the pop wheel of fortune, the bill adds up to a rare pairing of idiosyncratic individuality.

* David Byrne, with Joe Henry, El Rey Theatre, 5515 Wilshire Blvd., L.A. 8 p.m. Sold out. (323) 936-4790.

8 pm: Pop Music

There aren’t many 86-year-old guitar heroes around, but Les Paul more than qualifies--after all, his name is virtually synonymous with the solid-body electric guitar, which he invented in the 1940s. He can play the thing, too, and sparks figure to fly when the Wizard of Waukesha is joined on stage by such disciples as Dave Edmunds, Jeff “Skunk” Baxter and Eric Sardinas.

* Les Paul, House of Blues Anaheim, 1530 S. Disneyland Drive, Anaheim. 8 p.m. $40. (714) 778-2583. Also Saturday, House of Blues, 8430 Sunset Blvd., West Hollywood. 9 p.m. $40. (323) 848-5100.

all day: Movies

Martin Lawrence and Danny DeVito star as a professional thief and a ruthless businessman, respectively, who go to war over a good-luck ring in “What’s the Worst That Could Happen?,” a comedy based on the novel by Donald E. Westlake. Thief Lawrence breaks into DeVito’s supposedly unoccupied beachfront mansion only to come face to face with the billionaire who promptly has him arrested, setting off a battle of wills. John Leguizamo, Glenne Headly and William Fichtner co-star.

* “What’s the Worst That Could Happen?,” rated PG-13 for language and sexual content, opens Friday in general release.

8 pm: Theater

“Will Shakspear” sets out for an acting career in London in “The Beard of Avon,” Amy Freed’s new comedy that explores art, human nature and the question of the true authorship of Shakespeare’s work.

* “The Beard of Avon,” South Coast Repertory, 655 Town Center Drive, Costa Mesa, Tuesdays-Saturdays, 8 p.m.; Sundays, 7:30 p.m.; Saturdays-Sundays, 2:30 p.m. Ends July 1. $28-$49. (714) 708-5555.

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FREEBIE:

Solo Projects will screen Andy Warhol’s seminal 1964 16-millimeter film “Empire” continuously for 48 hours Friday and Saturday at the Magic Castle Hotel, 7025 Franklin Ave., Room 102, Hollywood. Parking on Orange Drive only. (310) 271-9912.