This solve went the same way that Hemingway says you go bankrupt - "gradually, and then suddenly." We started it while we watched the NFL season-opener, and both of us were a little drowsy. I immediately got a few things, like CARROTCAKE (17A: Dessert often with cream cheese icing) (a personal favorite!) and then PUCE (1D: Brownish-purple) (Really? Wasn't that JUST in?!), EWOKS (26D: Endor natives) (Ditto! ... or was it "Endor?" Or both?), and a few other things. Frannie got APPLECIDER (12D: Press production) and KTEL (39A: Onetime TV music vendor), IND (22D: Not the party type? Abbr.) (Nice!), and several others. Then we both drifted off while the Ravens looked to be beating up on the Broncos.
When I woke up, Peyton had taken charge. Seven TD passes!? Really? It got interesting for a minute there in the third when that idiot dropped the ball before crossing the line, but not quite interesting enough to keep me from picking up the puzzle again. And this time, things just started to drop.
A lot of it today just seemed like tricky clues for very standard entries. I thought of LPGA immediately for 18A: Ironwoman org.?, but hesitated because I didn't (and still don't) know exactly what they're referring to. Is that a specific tournament? Is it because "irons" are used in golf? Anyway, all I really needed was female + sports organization = LPGA. And the same was true of the clue immediately above - 16A: Only event in which Venezuela medaled at the 2012 Olympics (EPEE). Had no idea that that was true, but fewer puzzles DON'T contain "epee" than do. That kind of thinking ended up working against me, though, with 49A: "Revolution 9" collaborator. I thought "music person + somewhat unusual + three letters = "Eno."" Nope. Did John Lennon even know Brian Eno? I kept asking myself. Are the ages too different? Duh. It was ONO.
Not a terribly exciting puzzle. Good "Huygens material" though, with BCUP (48D: Smallish lingerie spec) and OTHERWOMAN (56A: One-third of a triangle, maybe). The latter was also one of the better clues. Much of the long fill was just kind of boring.