Puzzle

 ACROSS

  1 Old West bud

  5 Hemsworth of "Isn't It Romantic"

  9 Despicable dudes

 13 Has left for lunch, say

 15 Boo-boo

 16 Andy's boy

 17 "Right now!"

 19 Taken by mouth

 20 Presentation from Jane Goodall or Julia Sweeney

 21 Outlet for whistle-blowers

 23 Light beam splitter

 25 Takes a spin class

 26 Heroes : rolls :: gyros : ___

 29 More, in Mexico

 31 Clumsy sorts

 32 President Quincy Adams

 33 Twice-baked Italian cookies

 35 Fashion designer Anna

 36 Hurler at the center of this puzzle's theme

 37 Stole a base, e.g.

 40 Judge of movies?

 42 Capital of Norway

 43 On the razor's ___

 44 Sault ___ Marie

 45 Makeup of the web

 46 Interior designs

 48 Wee

 50 "Invisible Man" author

 52 "Same here"

 56 Hoppy brews, briefly

 57 What one might say after a long vacation

 59 Essence

 60 Common mirror shape

 61 Water collection pits

 62 Loch in many questionable photos

 63 Makes leather

 64 Wee

DOWN

  1 College west of Penn

  2 Activist and athlete Arthur

  3 Doping scandal substance, informally

  4 Bunny collector?

  5 Key figures?

  6 ___ Jima

  7 "___ Misbehavin'" (stride jazz classic)

  8 Battlefield healer

  9 One who's with it

 10 Day for many pranks

 11 Keaton and Sawyer

 12 Tennis great Monica

 14 Former Russian autocrats

 18 Yalie

 22 Tchaikovsky who wrote "1812 Overture"

 24 Geico Gecko and LiMu Emu

 26 Comfy nightwear

 27 Promise to repay, for short

 28 Low-grade

 30 Yiddish chumps

 33 Container for recyclables

 34 Ref. that added "xoxo" in 2019

 36 Sights at a boardwalk

 38 It has a head and is heady

 39 Turndowns

 41 Self-centered ones

 42 Crude surplus

 43 British fish dish

 45 Blinds strips

 46 Lower oneself

 47 Not ___ (far from ideal)

 49 Lovelace of early computing

 51 Suddenly bright star

 53 2019 Best Actor winner Malek

 54 WNBA game channel

 55 Online crafts seller

 58 Fellow

Solution