I'll go conservatively with 160k.
MM-Dodson is probably good for 100k. Arlovski-Mir and the rest of the card will pull some more, but not a ton.
It's a pretty uneventful week for sports, but it's also the first week leading into the school year for a lot of families so I can see it being low on the priority list. It's also the Labor Day weekend so I can see a lot of families using it as a last vacation weekend for hunting trips, cottages, etc.