Explanation: Seven symmetrical across entries become proper nouns when their first letters are capitalized. These seven words can then be the fill for seven of the down clues- 1A & 28D, 18A & 27D, 30A & 38D, 40A & 11D, 49A & 48D, 64A & 21D, 72A & 53D. The first letters of the down clues spell the meta answer: READING
Had to reveal -- I did see a lot of the pairs but just couldn't make things work -- although at one point, I did kinda wonder/hope if there was a Shakespeare villain named Herb.