I have stayed there before, this time I visited to run the Cowtown marathon which is a large event. The event had issues with the shuttles back to hotel, we couldn’t control that, it was not easy to get uber/lyft to get out of event, I called the lobby to ask for support in extending check out at noon, and they denied, only allowimg me until 11:30 AM were not very friendly about it, i wish they would, we were many people having to walk from event, i could not even took shower as I was there 11:41 AM and could only got my things out.
My only suggestion would be to be open to this events, I visit often DFW. The lady in fron desk told me to refer to additional costs of extending hours. I travel often to Austin, Dallas area and even other hotel chains for running events, and I have never been denied it, I don’t usually ask for it, since I usually stay another day, but I feel when you have large events in town, you should be a bit flexible for an hour.