What a weird-looking grid today! The middle section seems isolated from the north and south swaths of white, but the flow was not really all that bad for me. And that start of the puzzle was outstanding, with the triple stack of 8-letter answers.
So Mr. Radnor, who I recognize barely when I Google his name and see his picture, has crafted a winner of a celebrity puzzle, with Mr. Chen's expert help. I really love the revealer, which definitely wins for best revealer of the week so far (perhaps the previous two days set the bar a bit low, I admit). 50A: Calculated ... or a punny hint to 18-, 24-, 32- and 44-Across (PREMEDITATED) is a lovely way to reveal why OM- was added to each of the theme answers. I didn't need "punny" in the clue, however.
Meanwhile, the theme answers are pretty good. My favorite is 44A: Makes an unabridged humor book? (OMITSNOJOKE). It takes a definitely recognizable standard phrase ("it's no joke"), completely reworks it by adding the OM-, and then has a truly wacky clue. The idea of an immense book of jokes that leaves not a single one out is chuckle-worthy.
The others aren't quite as good, although I'm impressed by finding so many ways of using the OM- starter, particularly OMALLEYRATS, with the unexpressed apostrophe.
Meanwhile there is so much lovely stuff in the fill. I had a good feeling with 1A: Not seen by the theater audience (OFFSTAGE), perhaps a nod to Mr. Radnor's day job. But then to include the Ferris Bueller reference with DRONESON, and the fine clue at 16A: Women rush to get into it (SORORITY) was fine stuff.
I'm not convinced by OCTOPOD, but we ended with a nice reminder of things we hope to see on Sunday with TDPASSES. Oh, and 38D: It has no point (INTEGER) is going on the list of best clues of 2018.