7,555
Couple things (maybe 5) they were getting 7,800 standing room only in a 7,200 capacity Gallagher back when the univ attendance was ~14k. How many ~45k universities today can't get 2.5k? The big meets were Bedlam/OU and Iowa State, those three were almost always top 3-5 programs then along came ASU. ~1985 they expanded to ~13,615 had a new record 14,059 couple years ago for Iowa. All the other big time arenas, might be less than 5, are basketball where they alow em to hold a wrestling event.
If you look ^^^ yes there are 5 figures, maybe more.
btw: I'm gonna ask my good buddy Wkn to run the figures for a data table on the top D1 wrestling dual meet attendance/student population events over time, lets give him 5 days to put it together.