Solution

 

Puzzle

 ACROSS



  1 Dads

  4 Construction project on a snow day

  8 Pocket liquor containers

 14 One may be electric

 15 Reebok rival

 16 Was nearly depleted

 17 Common T-shirt feature

 19 Total

 20 Jr., formerly

 21 Staggers

 23 "I have no ___!"

 24 Evens up

 26 Ascots and cravats

 28 "Big" WWI gun

 30 Colosseum spectator's garment

 31 Overcome by persisting

 33 One might purchase a train

 37 UFO crew

 38 Put in office

 41 Kind of sauce or milk

 42 Authority

 45 Unpretentious

 48 Vehicle hidden in "exit ramp"

 51 Famous street of children's TV

 52 Do-it-yourself suds

 56 Roof overhang

 57 Phone dial abbr.

 58 Taking things literally?

 60 "The Simpsons" bus driver

 63 Bitter discord

 65 Nickname for a Miller Park team

 67 Nautical steering device

 68 "Old gray" horse of song

 69 Holiday ___ Express

 70 Dwarf with allergies

 71 Fine powder

 72 S&L offerings

DOWN



  1 Bench press muscles, informally

  2 Prefix for "dynamic"

  3 Rested worry-free

  4 Enthusiast

  5 Galosh

  6 What's often thrown at a wedding

  7 Already reserved

  8 Watercolor on fresh plaster

  9 PC linking acronym

 10 Like peace doves

 11 End of many an inflatable obstacle course

 12 South ___ (Yuna Kim's country)

 13 Say "#$@&!"

 18 Chopper sound

 22 Tennis do-over

 25 Takeoff guess: Abbr.

 27 USSR's CIA

 28 Software test version

 29 Piercing tool

 31 Name that's a word meaning "stitch" backward

 32 Nancy Drew's boyfriend

 34 Like some yoga poses

 35 Rounded roof

 36 Tiger part in a Survivor song

 39 Sin/___ = tan

 40 High-frequency speakers

 43 Free from bacteria

 44 Sphere

 46 Org. concerned with cyber threats

 47 Widespread destruction

 49 Vein counterpart

 50 "I've seen better"

 52 Ellen DeGeneres and Oprah Winfrey

 53 Agree to be spammed, say

 54 Singer Haggard

 55 Site with a Symptom Checker

 59 Herr's wife

 61 Look after

 62 Has

 64 Tasseled topper

 66 Like a rainy day