Theme: It's Clobberin' Time! - Just read the first words of the entries and you have Batman meeting The Thing.
17A. Like the 1920s-'30s, economically : BOOM OR BUST BOOM!
24A. Excellent work : BANG UP JOB BANG!
35A. Dramatic weight-loss program : CRASH DIET CRASH!
49A. Deadeye with a rifle : CRACK SHOT.(or crackshot) CRACK!
59A. Hectic pre-deadline period : CRUNCH TIME CRUNCH!
Argyle here with what appears to be a new constructor. The theme probably has been done before but if so, I doubt it was done as well. Impressive grid with the seven letter risers in two corners. I'm running late and I have some linkin' to so, so here goes.
1. Parking lot fillers : CARS. Too easy?
5. "Me too!" : "SO AM I!"
10. Cutlass automaker : OLDS
14. Nike competitor : AVIA
15. Valuable violin, for short : STRAD. (Stradivarius)
16. Genesis or Exodus, e.g. : BOOK
19. Wild revelry : ORGY
20. Audition hopefuls : ACTORS
21. Enjoyed a sail, say : BOATED
23. Indian melodies : RAGAs
27. Dean's email suffix : .EDU
28. Japanese sash : OBI
30. Back of a flipped coin : TAILS
31. 2,000 pounds : TON
32. Uncooked : RAW
34. Greek messenger of the gods : HERMES. Hermès, if you're fashionable.
38. Geek Squad member : TECHIE. The boys at Best Buy.
41. Fireworks reaction : [OOH!]
42. EPA-banned pesticide : DDT. Some controversy now that maybe an out-right ban was too strong for the good that it does.
45. Roger who broke Babe Ruth's record : MARIS
46. Refusals : NOs
48. Prior to, in poems : ERE
53. "A Doll's House" playwright : IBSEN
55. Decorative inlaid work : MOSAIC
56. Watchful Japanese canines : AKITAs
57. Comet Hale-__ : BOPP
61. Thought from la tête : IDÉE
62. Hayes or Hunt : HELEN. Both great actresses but from different eras.
63. Slaughter in the Baseball Hall of Fame : ENOS
64. Surrender, as territory : CEDE
65. Grab : SEIZE
66. Emailed : SENT
1. Musical set at the Kit Kat Club : CABARET
2. Guacamole fruit : AVOCADO
3. Tear gas weapon : RIOT GUN
4. Margaret Mead subject : SAMOA. "Coming of Age in Samoa"
5. Georgia and Latvia, once: Abbr. : SSRs. (Soviet Socialist Republic)
6. Horseplayer's haunt, for short : OTB. (Off Track Betting)
7. Island near Curaçao : ARUBA. Win enough at OTB and you can be here.
8. Perry in court : MASON. With Della Street at his side.
9. Convention pin-on : ID TAG
10. Section of a woodwind quintet score : OBOE PART
11. Conrad classic : "LORD JIM". A novel by Joseph Conrad originally published as a serial in Blackwood's Magazine from October 1899 to November 1900. I missed it. My subscription lapsed.
12. Guard that barks : DOG
13. Big __ Country: Montana : SKY. Big shout out.
18. Approximately : OR SO
22. One-to-one student : TUTEE
24. Prejudice : BIAS
25. Corrida cry : ¡OLÉ!
26. Undergraduate degrees in biol., e.g. : BSs. (Bachelor of Science)
29. Scottish hillside : BRAE
33. Detective's question : WHO
34. Sunshine cracker : HI HO
35. Massachusetts city crossed by four Interstates : CHICOPEE. Two are auxiliary Interstates.
36. Insurance covers them : RISKS
37. "Please stop that" : "DON'T!"
38. Film lover's TV choice : TMC. The Movie Channel is on Showtime. Yes, I tried TCM.
39. Corn serving : EAR
40. Hardly roomy, as much airline seating : CRAMPED
42. Preordain : DESTINE
43. "It'll never happen!" : "DREAM ON!"
44. Most uptight : TENSEST
47. Many a Punjabi : SIKH
50. Goldman __: investment banking giant : SACHS
51. New employee : HIREE
52. Eyelike openings : OCULI. Oculus, singular.
54. Tugs at a fishing line : BITES
56. Clearasil target : ACNE
57. Clic Stic pen maker : BIC
58. Poem that extols : ODE
60. Pince-__ glasses : NEZ