Theme: Where did you go this summer? - Maybe you stayed home but the four theme entries start with a type of the unifier.
18A. Experienced tradesperson : JOURNEYMAN
27A. Military stint : TOUR OF DUTY
47A. Bank heist idler : GETAWAY CAR
62A. Pulverizing tool powered by gravity : TRIP HAMMER
38D. Break suggested by the starts of this puzzle’s four longest answers : VACATION
Argyle at home. We start the work week with a meaty offering of themes and fill. Some oldies drop in for a visit; gives the puzzle a lived-in feel.
Across
1. Sunday celebration : MASS
5. Streisand, to fans : BABS
9. __ d’art : OBJET. A French phrase that actually is what you think it is.
14. “Don’t think so” : "UH, UH". OK, you can have your own opinion.
15. Spherical hairdo : AFRO
16. “We tried everything” : "NO USE"
17. Frozen dessert franchise : TCBY. (The Country's Best Yogurt, formerly This Can't Be Yogurt)
20. “I knew it!” : "AHA!"
21. Wrestling duo : TAG TEAM
22. Set (down) : PUT
23. 2002 Best New Artist Grammy winner Jones : NORAH. Old Hank Williams song.
25. Openly declares : AVOWS. I tried AVERS first.
31. High-end German car : AUDI sharing the Autobahn with 58D. High-end German cars : BMWs
34. Dutch bloom : TULIP
35. Neeson of “Unknown” : LIAM. If he's unknown to you, here.
36. Rocker Bon __ : JOVI
39. Al or Bobby of racing : UNSER. Or Jerry or Al Jr.
42. Old Ford models : LTDs
43. Fields for flocks : LEAs
44. Delete : ERASE
46. Marine predator : ORCA
52. Fed the poker pot : ANTED
54. “Groovy!” : "NEATO!"
55. Plop down : SIT
57. Gave power to : ENABLED
61. Old hand : PRO
64. A blue moon, so to speak : AGES
65. Overplay the part : EMOTE
66. Actor McGregor : EWAN. Here is his IMDb site.
67. One of the deadly sins : LUST
68. Pastor’s abode : MANSE
69. Tax return IDs : SSNs
70. Tunneling insects : ANTS
Down:
1. Deviant sci-fi character : MUTANT
2. Sound of a sneeze : [AH-CHOO!]
3. Outback automaker : SUBARU
4. Bashful : SHY
5. Peninsula bordering California : BAJA
6. In __: out of it : A FOG
7. Very dry, as Champagne : BRUT
8. Angry with : SORE AT
9. “__ Time”: ’70s jazz musical : ONE MO'. A lackluster review. Link.
10. Baby in blue bootees : BOY
11. Skydiver’s outfit : JUMPSUIT
12. Biblical birthright seller : ESAU
13. Canvas shelter : TENT
19. Seagoing military force : NAVY
21. Commandments pronoun : THOU
24. Craftsperson : ARTISAN
26. South Dakota’s state fish : WALLEYE. Why they are called WALLEYE. Link.
28. Winter bug : FLU
29. Very loud noise : DIN
30. Surprise win : UPSET
32. Family man : DAD
33. AOL pop-ups : IMs. (instant messaging)
36. “The Back-up Plan” actress, in tabloids : JLO. Her IMDb page.
37. Atop, poetically : O'ER
40. Historical span : ERA
41. Uncooked : RAW
45. Hourglass stuff : SAND
47. Actress Rowlands : GENA. Her IMDb page.
48. One of four singing brothers : ED AMES. Ed's back again.
49. Toy that goes “bang” : CAP GUN. It was POP GUN last Thursday.
50. Not moving : AT REST
51. Henhouse perches : ROOSTS. The chickens have come home to roost... again.
53. Little laugh : TE-HEE. Still giggling since Sunday's giggle?
55. Champagne flute part : STEM
56. “__ la Douce” : IRMA. One last IMDb link.
59. Tilt to one side : LEAN
60. Sea eagles : ERNS. Today without the second E.
63. Liq. measures : PT's. (pint)
64. Pie __ mode : À LA. Sweet as Irma.
Argyle