Occasion that, per Wikipedia, "starts whenever someone declares it, and ends whenever they stop." ... also the only way the answers to 17-A, 32-A, and 37-A make sense
59A
Typo often mocked online
60A
Puts together
61A
Dolly, notably
62A
Extreme suffix
63A
Woody Guthrie's "I Ain't ___ Home"
64A
Nine-digit ID issuer
Down
1D
[Thinking]
2D
Miniature display
3D
Famous feature of Phillip Rivers' throws
4D
D.C. VIP
5D
Disentangle
6D
Catch-22, for example
7D
Some beetles
8D
Yang's partner
9D
More curious
10D
Vetted
11D
Young swans
13D
Dude
14D
Look, rudely
17D
Everyone is raving about it!
22D
"Silly Jedi Master"
23D
Trans descriptor
24D
Store with a Kirkland Signature brand
27D
Accused plagiarist Kaur
28D
Papers stuck on the fridge, maybe
31D
"My bad!"
32D
Apt rhyme for "guile"
35D
As you like it
36D
Band aids
37D
"Thanks for reminding me!"
38D
Reach the sum of
39D
Direct to the exit
40D
Moralistic declaration
41D
Affectionate poems directed to Terry Gross and Robert Siegel, maybe?