60,000 sounds like a very doable number at Beaver Stadium, if combined with a Football Game.
Penn State generally gets that many and sometimes considerably more for the Spring Blue-White Game.
Actually, while that is a nice number, if they promoted it well on a home football weekend, against a good team, I'd be a bit surprised if they couldn't exceed 60,000.
Just guessing of course. Would depend a lot on the weather too. Must say, Iowa and OK St picked an absolutely wonderful November day for this match. That alone had to be a big boost for their attendance and may be very hard to match in other Big Ten locations in November.
Great day for College Wrestling. Plus, it was a very fun match to watch, with lots of talent and a cliff hanger ending. Congratulations to the Hawkeye and Okie State staffs and administrations for pulling this off so well. Well done!