puzzle

 ACROSS

  1 Cellist Casals

  6 Baby carriage, to a Brit

 10 Actress Kate or Rooney

 14 Model of perfection

 15 Nelson's laugh on "The Simpsons"

 16 Metal with the symbol Fe

 17 Kick off date night, say

 19 Pro ___ (proportionately)

 20 Not as expensive

 21 Musical finale

 22 Secretive group

 23 Doc hidden in "patients"

 24 Totally awesome

 26 Where bubble tea originated

 28 Certain flower girls

 29 Aerodynamic

 30 Whiskey barrel

 33 Co. with blue lawn signs

 34 Some birds' peepers, and a phonetic hint to three letters within 17-, 24-, 50- and 59-Across

 38 PC's "brain"

 41 Columbus MLS team, or a synonym for "team"

 42 In need of vacuuming

 46 Intricately decorated

 49 "Hooray!"

 50 Pasta lover's nightmare?

 54 "___ & Oh's" (Elle King hit)

 55 Boot out

 56 Smallest of a litter

 57 Presidential rejection

 58 "Dibs!"

 59 Organizer in a binder

 61 Tacks on

 62 Emmy winner Falco

 63 Deck out

 64 Loch ___ monster

 65 Bobcat, e.g.

 66 Catch with a rope

DOWN

  1 Babies in sties

  2 Gland near a kidney

  3 ___ Boys ("Fight for Your Right" band)

  4 Most popular dogs, per the AKC

  5 Ancient

  6 ___ Penh

  7 Genre for Aretha Franklin

  8 Yet to come

  9 Scrape or scuff

 10 Desert illusion

 11 Flavorful kind of coffee bean

 12 Spun

 13 One may look for trends

 18 Widely admired person

 22 Movie FX

 24 "The Great British ___ Off"

 25 Like a lefty's hand after using a fountain pen, often

 27 It might catch a fly

 30 Rank below capt.

 31 Response to a captain

 32 Leave in stitches?

 35 Laptop brand

 36 Abridge, maybe

 37 "How's it goin'?"

 38 Camping gear maker

 39 Bring home the bacon

 40 Relaxes

 43 Skimpy swimsuits

 44 Some distracted drivers

 45 Like 20 Questions questions

 47 What a VIP pass offers

 48 Bit of bod art 

 49 Word from the Tibetan for "rocky" and "bear"

 51 Quarterback with the most Super Bowl wins

 52 Append, as a vocal track

 53 S&P 500, for one

 57 Spanish for "life"

 59 Bus. card number

 60 Former WNBA president Ackerman

solution