"The Effect of ___ Rays on Man in the Moon Marigolds" (Paul Zindel Pulitzer Prize-winning play)
15A
"Queen ___ Approximately" (Bob Dylan)
16A
S&L takeback
17A
Like Holmes's game
18A
Name for 1/3 of Henry VIII's wives
19A
Un plus un est ___ a deux
20A
Non-religious philosophy emphasizing reason, ethics, inquiry, and the inherent dignity of all people.
23A
Interim, more formally
24A
Make them to make a right
25A
Rule that ended in 1947
27A
Capisce?
30A
Thailand, once
34A
Unnatural habitat?
36A
"Norman Fucking Rockwell" singer
37A
Communitarian child-raising philosophy
40A
Pinches or boosts
41A
Word whose meaning becomes its opposite when preceded by "quite a"
42A
Ongoing Tour of note(s)
43A
Sweetener without a spoiler alert
44A
Wordy gift
46A
Weathers
50A
Dire wolf recovery site
55A
John Donne's phrase of interconnectivity
58A
Help make an illegal wager, e.g.
59A
Spumante source
60A
Equivalent of a 6 Across
61A
Good name for a singer (like Braxton, Basil, or Tennille)
62A
Gaiman or Young
63A
Let flow (or oust beavers, I suppose)
64A
Match parts
65A
All of Strait's live in Texas
66A
Fixes a word salad, maybe
Down
1D
Astounded
2D
Nilla thing
3D
Standard Oil successor
4D
"Too rich for me"
5D
Century-old British magazine featuring an annual "Little Black Book" of "the most eligible, the most beddable, the most exotically plumaged birds and blokes in town"
6D
Cracked
7D
"____ da Carnaval" (Luis Bonfa standard also known as "Theme from Black Orpheus" and "A Day in the Life of a Fool")
8D
MMXXIV, e.g.
9D
First words sung by Tommy in the Who's "Tommy"
10D
"Frozen" kingdom
11D
College official
12D
Controllers, usually
13D
Baggins portrayer
21D
Stuns
22D
Seraph, e.g.
26D
"___ Boys" (Louisa May Alcott)
28D
Ginormous
29D
Sight seeing necessities?
30D
"Alas," e.g.
31D
Langston Hughes poem ("___ sing America")
32D
Ian McEwan novel made into a film starring Saorise Ronan and Keira Knightley
33D
Cars that anagram to SAME STAIR
35D
Lout
36D
Hindu holiday of light
38D
Single out
39D
Chillax
45D
The only surviving pre-Indo-European language in Europe
47D
Rehm or Lane
48D
English county extending from greater London to the North Sea
49D
Composer Erik ___ ("Gymnopédies")
51D
Anodyne
52D
Canadian magician/skeptic James ___, known for debunking paranormal claims (I can't clue him by his stage name because of 21 Down)
53D
Words introducing an over time?
54D
Of the first twelve U.S. Presidents, surname of the only two who did not own slaves
55D
DC team that may be in playoff contention next year, says this hopeful fan
56D
It can tune an orchestra but it can't tuna fish
57D
Lofgren of Crazy Horse, the E Street Band, and Grin