do they accept AARP discount even if the rooms have been blocked for the upcoming Austin indoor volley tournaments at Kay Bailey Hutchinson Convention Center?

I would give a call you never know.

If I were you, I would take time off from work, pack my bags, travel to Dallas, valet park my car, walk in to the front desk and ask them your question. Or call.

I don't think soo but you might wanna call the front desk.

No, if you can't book a room, you can't apply a discount.