Puzzle

 ACROSS

  1 Speak off the cuff

  6 File that may be read-only

  9 Takes ten

 14 Tranquility

 15 Organ with a drum

 16 State ID?

 17 Clear wrap brand

 18 "Live Free or ___"

 19 One of many on a Shasta daisy

 20 Netflix series in which Taylor Schilling played Piper Chapman

 23 Soda brand whose name is a soda can part

 24 Sir, to Beyonce and Jay-Z

 25 Itinerary word

 28 Classic TV show set on an island

 31 Monotony

 36 Ultimately profits

 39 "No man is an island" poet

 40 Boorish

 41 Tales that are spun

 43 No longer working: Abbr.

 44 Prickly plant

 46 Dessert with a dense lower layer of chocolate custard

 48 Picked up without touching, say?

 50 Relatives of hisses

 51 Drink often served with scones

 52 Heavy weight

 54 Fiscal org. based in D.C.

 56 Treat with two kinds of icing

 64 Frighten

 65 ___ pal (rhyming friend)

 66 Group of rooms in a hotel

 67 Like "It"

 68 Many mins.

 69 Thin chip maker

 70 "Tales From the ___"

 71 Lower digit

 72 Mushroom parts

DOWN

  1 Lhasa ___

  2 Cherished

  3 Heroine in "Doctor Zhivago"

  4 Words from one who's unable

  5 East Indian, say

  6 Foot treatment, informally

  7 Candidate's platform

  8 Stews (over)

  9 Matured

 10 "East of ___"

 11 Fill with food

 12 Warming of relations

 13 Note that becomes a musical piece when "o" is added

 21 Ivory's partner

 22 Sexy

 25 Action words

 26 Accustom

 27 Introduce to the mix

 29 Spear with a fork

 30 Pulsate

 32 Brown building?

 33 Far from competent

 34 Loosen, like laces

 35 Jason's mythical wife

 37 Watery expanses

 38 Prefix meaning "inside"

 42 Unlikely to explode?

 45 Signal boost, in a way

 47 Assimilation of ideas

 49 Head-slapping comment

 53 Time for a fireworks show

 55 Rich source, as of knowledge

 56 Taiwanese tech giant

 57 ___ a soul (no one)

 58 Leak sound

 59 Root in purple boba

 60 Otherwise

 61 Certain bird or toy

 62 Twosome in Variety

 63 Wriggly swimmers

 64 NYSE overseer

Solution