Not The Saturday Prize Puzzle

NTSPP - 009 by Tilsit
Spot the Links

20a, 4d, 7d, 19d, 21d, 23d and 24d are all 14 down; as, it could be argued, are 17a, 1d, 3d and 5d.  Most have no definition.  Each clue (except 14d) contains an extra word, the initial letters of which spell out three names associated with the theme.