Thanks to Qaos for what was a very enjoyable puzzle.
I had intented to tackle this after game 6 of the World Series ended but, having read there was a theme, curiosity got the better of me and I started doing it on my phone while watching the game on my laptop.
I didn't run into any real problems for the first 75% or so, but then seemed to hit something of a brick wall. This led to my decision to put it aside until after the game had finished - which proved to be a wise choice indeed!
The NE in particular caused me all sorts of problems and then, even when I finally got those, I was still left with the pesky 20d.
Having read all the posts I knew this was the key to the theme but, even though I was sure who and where it was centred around, I just could not see it.
I then went back to basics and split the clue up into what I presumed were its component parts, 2 synonyms, one with an instruction and a definition and.... lo an behold - it hit me immediately.
Having gone on Wiki to read about the theme, I can only see 6 related clues, which is a lot fewer than you guys but I'll continue looking anyway.
Geeker @6 - thanks for that update, I must have missed or, more likely, forgotten his post about a changed schedule. Perhaps if he or Rogerm looks in he/they can confirm whether they are or are not the same person.
Stay safe:-)