Jack Pearadin and Doug Nelsen found a 1.73-carat diamond after nearly a year of searching the park's field.
Dr. Charles Kimball, author of "When Religion Becomes Lethal," will hold a lecture and booksigning at the Ron Robinson Theater, 6:30 p.m. Local bluegrass group Big Steel River will be at The Joint, 9:30 p.m. The Loony Bin will host a triple feature, with comedians Mark Matusoff, Jersey and David Graham, through Saturday, 7:30 p.m. Thursday, 7:30 and 10 p.m. Friday and Saturday, $7-$10.
Argenta Community Theater will host "Opera in the Rock," a night of one-act operas, 7:30 p.m. Friday and Saturday, $35. Comedy troupe The Main Thing will open the new production "Whatshisname?" at The Joint (running through Oct. 25), 8 p.m., $20. R&B singer Anthony David, known for his Grammy-nominated India.Arie collaboration "Words," will be at Club Trois, 8 p.m., $20-$40. Local metal groups Burning Addison, Vail, Enchiridion and Legions Await will be at Revolution, 9 p.m., $7. John McAteer and Gentlemen Firesnakes will be at Vino's with Pockets and Glittercore, 9 p.m., $5. Kansas indie rock group Middle Twin will be at the White Water Tavern with locals Whale Fire, 10 p.m.
Centro-Matic and South San Gabriel singer Will Johnson will be at The Undercroft at Christ Church, 8 p.m., $15. More Cowbell and Four on the Floor will play a benefit for Rick Skinner at Juanita's, 9 p.m., $5. Bobby Bare Jr. will return to the White Water Tavern, 9:30 p.m. Tomten will be at The Lightbulb Club in Fayetteville with High Lonesome and Doctor Nod, 10 p.m.
Indie rock group Delta Spirit will be at Juanita's with Little Rock favorites Amasa Hines, 8 p.m., $14 adv., $16 day of. Pennsylvania metal group Full of Hell will be at Revolution with Noisem and Ozark Shaman, 9 p.m., $7.
The Jazz Eureka Festival, featuring the Fayetteville Jazz Collective, Ellis and Delfeayo Marsalis, Rodney Block and more, will be held in downtown Eureka Springs through Sept. 14. The Clinton School for Public Service will host a presentation by Jeremy Rogoff, "How Do We Keep the Best Teachers in the Delta? Coach 'em up," at 6 p.m. Kevin Kerby will be at the White Water Tavern with Mark Edgar Stuart, 9 p.m., $5.