Rest and Recharge! The last word of each theme answer are things may need or have a rest.
18-Across. * Traditional Thanksgiving entree: ROAST TURKEY. This answer confused me a bit, but apparently a roast turkey needs to rest a bit before being carved. This gives the turkey time to reabsorb the juices so that the meat will be nice and juicy.
24-Across. * Feature of anxiety, often: RACING MIND.
35-Across. * The "order" part of a "Law & Order" episode: COURT CASE.
  47-Across. *   Piano lesson pages: SHEET MUSIC.  The musicians a Rests is a musical notation sign that indicates the   absence of a sound.  Each rest symbol and name corresponds with a   particular note value indicating how long the silence should last. 
And the unifier:
  53-Across. "Enough already!" or what one may do to each answer to a starred   clue: GIVE IT A REST. 
  Today's puzzle also acknowledges many of our regulars! 
Across:
  1. Cert. for some babysitters: CPR.  As in CardioPulmonary Resuscitation. 
  4. Golden St. region: SO-CAL.  As in Southern California. 
9. Chase a fly, maybe: SWAT.
  13. Summer arrival: LEO.  Hi, Leo III! 
  14. "Sweet Love" singer Baker: ANITA.  Anita Baker (née Anita   Denise Baker; b. Jan. 26, 1958) is a singer-songwriter best known for her   soulful ballads.  Her birthday is next week.  [Name # 1.] 
  15. Maker of G-Shock watches: CASIO.  Everything you wanted   to know about the G-Shock Casio watch, but didn't know to ask. 
  17. Sci-fi invaders: ETs.  As in ExtraTerrestrials
  20. Venezuelan cornmeal cake: AREPA.  Not a Tuesday word.    Arepa is a type of food made with cornmeal that is usually stuffed with a   filling.  It is a common street food in South America. 
  22. "Big Blue": IBM.  As in International Business Machines. 
  23. Certain sib: SIS.  My Sis and I traveled together on our   recent trip. 
  28. N. Dak. neighbor: MONT.  Hi, Montana! 
  29. Egyptian boy king: TUT.  If my full name was Tutankhamun,   I would probably go by Tut, too.  [Name # 2.] 
  30. Novelist Jaffe: RONA.  Rona Jaffe (June 12, 1931 ~ Dec.   30, 2005) wrote many novels.  She was big in the late '60s and '70s.    [Name # 3.] 
  31. Mean monster: BRUTE.  Ogre was not enough letters. 
  32. Cultural no-nos: TABOOs.
  34. Successful dogcatcher, e.g.: CAPTOR.  This clue and   answer feels a bit off. 
37. "Or even less": IF THAT.
  40. Hardly fresh: OLD HAT.  The origin of the expression   of Old Hat. 
  42. Alexander Hamilton's birth island: NEVIS.  If you've seen   the musical, then you knew immediately that Alexander Hamilton (Jan. 11, 1750s   ~ July 12, 1804) was born in Nevis and that he was killed in a duel by Aaron   Burr (1756 ~ 1836).  Hamilton was the 1st United States Secretary of the   Treasury and he still appears on the $10 bill.  [Name adjacent.] 
43. __-false test: TRUE.
44. This minute: NOW.
46. Trashy place?: DUMP.
  50. Words of agreement: I DO. 
  51. Big part of an alligator: JAW.  My first thought was Maw,   since the alligator has a big mouth. 
  52. Bygone anesthetic: ETHER.  A brief history of the use of Ether in medicine. 
  58. "How Easy Is That?" cookbook writer Garten: INA.  Ina   Garten (née Ina Rosenberg; b. Feb. 2, 1948) is best known as being the   Barefoot Contessa.  [Name # 4.] 
59. Aromatic bulb: ONION.
  60. Brief appearance in a film: CAMEO.  Alfred Hitchcock (né   Alfred Joseph Hitchcock; Aug. 13, 1899 ~ Apr. 29, 1980) was known for making   Cameo appearances in his films. 
  61. Tony winner Vereen: BEN.  Ben Vereen (né Benjamin   Augustus Middleton; b. Oct. 10, 1946) portrayed Chicken George in the 1977   television miniseries Roots.  [Name # 5.] 
  62. Group after boomers: GEN-X. 
  63. City considered Japan's cultural capital: KYOTO. 
64. Biblical craft: ARK.
Down:
  1. See-through: CLEAR.  //  And 4-Down. See-through   wrap: SARAN. 
  2. Domesticated rodent: PET RAT.  I'll pass on this pet. 
  3. Circular diamond shape: ROSE CUT.  Hand up if you   immediately knew about the Rose Cut. 
  5. Grammy-winning Yoko: ONO.  Yoko Ono (b. Feb. 18, 1933)   makes frequent Cameo appearances in the crossword puzzles.  I can't   believe she is nearly 90 years old.  [Name # 6.] 
  6. "Homeland" org.: CIA.  Homeland was American espionage   thriller television series that ran for nearly a decade. 
7. @ signs: ATs.
  8. Sonia Sotomayor, for one: LATINA.  Sonia Maria Sotomayor   (b. June 25, 1954) joined the United States Supreme Court in August 2009.    I can't imagine that she has a pleasant job.  [Name # 7.] 
9. Film on a pond: SCUM.
10. "This means __!": WAR.
  11. Invites to dinner, maybe: ASKS OUT. 
12. Connect with: TIE INTO.
16. Raw bar mollusk: OYSTER.
  19. Letters on an incomplete schedule: TBD.  As in To Be Determined. 
  21. Crunchy hummus scooper: PITA CHIP.  Yummers! 
  25. Backsplash binder: GROUT.  Everything you wanted to know   about kitchen backsplashes but didn't know to ask. 
  26. "Wuthering Heights" setting: MOOR.  Wuthering Heights is   a 1847 novel by Emily Brontë (July 30, 1818 ~ Dec. 19, 1848).  It   was initially published under her pen of Ellis Bell.  I probably read it   in high school, but the only thing I can tell you about the book is it   involves characters named Catherine and Heathcliff. 
  27. About to happen: IN STORE.  What comments are In Store   for us today on this puzzle? 
  28. Nattily dressed snack food mascot: MR. PEANUT.  The   nattily dressed Mr. Peanut (whose full name is Bartholomew Richard Fitzgerald-Smyth) has changed a   bit throughout the ages.  [Name adjacent.] 
31. Rager: BASH.
  33. Feathery accessories: BOAs. 
34. Military rookie: CADET.
  36. Whodunit board game: CLUE.  A brief history of   the game of Clue. 
  37. "Closer to Fine" duo __ Girls: INDIGO. 
  38. In a row?: FEUDING.  Row:  a noisy argument, but when used in this context the word rhymes with   cow. 
  39. Lifetime channel offering: TV MOVIE. 
  41. Japanese electronics giant: TOSHIBA.  A brief history   of Toshiba. 
43. Hitting sound: THWACK.
  45. Ballpark frank: WIENER.  The Boston Red Sox are known for   their Fenway Franks. 
  47. Won at musical chairs: SAT. 
  48. "I feel the same way": ME TOO. 
49. Curmudgeon: CRANK.
  51. Curse: JINX.  Hi, Jinx! 
  54. Geologic time unit: EON.  A crossword staple. 
  55. Line in a child's drawing of the sun: RAY.  Hi, Ray-o-Sunshine! 
  56. Full of feelings: EMO.  
57. "Quiet on the __!": SET.
  I Rest My CASE. 
Here's the Grid: