Theme: Celebrity Coupling - An "in language" pairing is reimagined with the first word representing a famous person and the second a comestible.
20A. Photo caption for Condoleezza with a bowl of pintos? : RICE AND BEANS
36A. Photo caption for Chris with a sandwich bun? : ROCK AND ROLL
42A. Photo caption for NFL Hall of Famer Sam with a pastry shell? : HUFF AND PUFF
58A. Photo caption for Kevin with his Easter basket? : BACON AND EGGS
Argyle here and a four row theme grid. No reveal needed but you have two things to solve; who the celeb is and what the food is. Slight weakness in that two of the second words don't change meaning from the base pair (BEANS, EGGS) and the other two do change. (ROLL, PUFF) The first pairing gave it way but I still needed perps to confirm my people. A secondary result is the initials are somewhat famous, too. R&B, rhythm and blues; R&R, military time off; H&P, medical use, History and Physical examination; B&E, police speak for Breaking and Entering. Pretty sure it's unintentional; you can take almost any *&* and find it has a meaning.
Across:
1. "The Aviator" actor Alan : ALDA
5. Subtle attention-getter : "PSST!"
9. Charge the quarterback : BLITZ
14. Enter : GO IN
15. Indian princess : RANI
16. Haunting : EERIE
17. Boot out : OUST
18. __ before: deadline words : ON OR
19. Gone up : RISEN
23. Take for granted : ASSUME
24. Neptune's domain : SEA
25. White lie : FIB
28. Fillable flatbreads : PITAs
31. Ultimatum words : "OR ELSE!"
33. "__ as directed" : USE
38. Headlights-in-fog effect : HALO
40. Put on television : AIR
41. Film spool : REEL
47. Farm pen : STY
48. Joins : UNITEs
49. Uncomplaining type : STOIC
51. Chewie's shipmate : HAN
52. Like many a morning coffee: Abbr. : REG.ular
54. Fake : UNREAL
61. Jeweler's unit : CARAT
64. Fat used in baking : LARD
65. Bellini's "Casta diva," e.g. : ARIA
66. Love : ADORE
67. Not busy : FREE
68. Become softened by cuteness : MELT
69. Study aids : NOTEs
70. Whole bunch : SCAD
71. Canonized mlles. : STE.s French saints.
Down:
1. Greek marketplace : AGORA
2. Jazzman Armstrong : LOUIS
3. Spinal column components : DISCS
4. Poker dealer's request : "ANTE UP"
5. Characterized by : PRONE TO. Some poker players are characterized by their failure to "ANTE UP" and are PRONE TO being called out on it.
6. Material for some castles : SAND
or
7. Supercilious sort : SNOB
8. Runs out of gas : TIRES
9. "The Natural" author Malamud : BERNARD
10. Luau keepsakes : LEIs
11. 1040-reviewing org. : IRS
12. __ score : TIE
13. Path to enlightenment : ZEN
21. "The Kite Runner" boy : AMIR
22. Really long time : AEON
25. Arctic ice phenomena : FLOES
26. Land in a river : ISLET
27. Beer __ : BELLY
29. Military sch. : ACAD. (academy)
30. Decides not to go to : SKIPS
32. Goof up : ERR
33. "Yep" : "UH-HUH"
34. Steamy setting : SAUNA
35. Pixielike : ELFIN
37. Stuck in __ : ARUT
39. Many a time, poetically : OFT
43. Fizzes up : AERATES
44. Fraction of a min. : N-SEC
45. Word seen on cornerstones : FOUNDED
46. Come across : FIND
50. Bath & Body Works products : CREAMS
53. Plays a round : GOLFS
55. Everglades wader : EGRET
56. Physically well-coordinated : AGILE
57. Exams for legal wannabes, for short : L-SATS
58. Like floors without rugs : BARE
59. Pusher catcher : NARC
60. Vicinity : AREA
61. Item in a food drive donation : CAN
62. Brouhaha : ADO
63. Go bad : ROT
Argyle