What took place during World War I on December 24, 1914
20A
Long survey to fill out
22A
A class of bugs missing "ins"
23A
Surgery rooms, for short
24A
Opened up during a dental exam, maybe?
28A
Sneaky tactic
30A
Shortest month, in a way
33A
Stop in Québec?
34A
Physician and TV personality who recently ran for Senate (and failed)
35A
Many an emoji
36A
What is hidden in the circles from 18A18AWhat took place during World War I on December 24, 1914[----------], 20A20ALong survey to fill out[-------------], 47A47ADoctor's surgical subspecialty for sinuses[-------------], and 54A54AReaction to a tantalizing banquet[----------]
39A
Sheep sounds
40A
Nintendo rival
41A
Aquatic plant life
42A
Since Jan. 1, on pay stubs
43A
The vowels without "you"?
44A
"Guess I'm missing out"
45A
&
46A
Podded plant
47A
Doctor's surgical subspecialty for sinuses
54A
Reaction to a tantalizing banquet
55A
Stitching
57A
Belgian painter James
58A
Spanish assent, twice
59A
"10 Things I ___ About You"
60A
Childish comeback
61A
One 60-trillionth of a min.
62A
"Was it ___ I saw?" (palindrome), what one might say in a subway stop
Down
1D
ChapStick target
2D
Where the Tigris and the Euphrates flow
3D
Rios of Netflix series Elite
4D
What you pay to play
5D
You need one to light a candle
6D
Understood but unspoken
7D
Black-and-white cookie
8D
Coffee source
9D
Dismal
10D
Some mortgage adjustments, in brief
11D
"The Kite Runner" protagonist
12D
Bog down
13D
Left no crumbs
19D
What you do to an alarm
21D
"From ___ shining..." Johnny Cash song
24D
Stayed on the sidelines
25D
Enlightened Buddhist
26D
Library motto, maybe?
27D
Dict. offerings
28D
Response to "Grazie!"
29D
Bugs Bunny's girlfriend
30D
Chutney fruit
31D
Play the role of
32D
Opposite of "noes"
34D
"Three" in German
35D
Succumbed to gravity
37D
What you might find on Chegg or Coursehero
38D
Their calendar ended in 2012
43D
College class dealing with human societies, for short