_{This puzzle is a part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted reply to this query can be awarded a bounty value 50 status.}

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Across

1 Pollo accompanier
6 Flies
11 Ministerial costume
14 Excrement
15 Gotta go (2 phrases)
16 Primary
18 Try to win
19 An Asian fruit
20 A report
22 A putative play about what one actually desires beneath the Christmas tree (4 phrases)
25 City close to Ramla
26 Shawarmas, type of
27 Blacklight emission: abbr.
28 King from Benjamin
31 Line from Pulp Fiction (3 phrases)
33 Polish movie of 2018
34 Comparative, in tempo
35 HIV, e.g.
36 (with 55 Across) A Teletubby
38 A putative play a few Frozen princess at Yuletide (2 phrases)
45 Curry
46 Goodbye
47 Theft
50 An actual play, putatively about Santa’s go to (3 phrases)
53 It slips my thoughts: abbr.
54 It decides what’s Span.
55 (see 36 Across)
56 Saxophonist-bandleader Georgie
59 Relevant
64 Bono mate
65 Flyer Chang
66 Boomerish, maybe
67 2022 hurricane
69 A putative play about Santa’s journey (3 phrases)
75 Soap author Anderson
76 Try fooling (2 phrases)
77 Fork and knife, for instance
78 It could also be ethnic
79 Hammond startup
80 Overweight
81 However
82 Seaweed jellies
83 Mayan ethnohistorian Eduard

Down

1 Like superb wine
2 Germanic letter
3 Darn
4 (see 9 Down)
5 Tornado rider
6 New Zealand evergreen
7 Putative Miss Huggenkiss of Springfield
8 “El ___ Pasa”
9 (with 4 Down) The playwright (2 phrases)
10 Floor in London
11 Nannies
12 Where to bowl
13 A amount of rubbish, maybe
17 Innocent
21 Omicronian chief
23 Mrs. Bunker
24 Mikado lyrics (2 phrases)
28 Baths
29 Fails to be
30 Early ISP
32 Quantum electrodynamicist Paul
33 Deejay Casey
35 Appt. e-book, maybe
37 A horse loser
39 Pest on crops
40 RStudio, e.g.
41 Game sequence begun in 1989
42 It could also be excessive
43 Saki
44 Surrender
48 Without a date
49 Those in Scotland
51 Mesopotamian
52 Electronics producer
56 Knee tissues: abbr.
57 Oopsies: hyph.
58 Isolated
60 Italy’s heel
61 Cheering
62 Nicaraguan chief
63 Vex
64 Dress
66 Grey snow
68 Cars
70 You are more likely to be eaten by it
71 Hamm and Lord
72 Coward
73 Otherwise
74 Flemish river