What do you do when you are at a conference and captions are not provided? First, you probably get angry or frustrated, especially if you tried to arrange accommodations in advance. There is no excuse for a conference to not be accessible, but sadly it still regularly happens.
I experienced this myself recently, but rather than quit or leave or yell, I decided to improvise. Luckily the on-site planners were willing to experiment and together, we created a free workaround that displayed auto-captions on the main presentation screen using the built-in captioning feature in PowerPoint.
While this was not a perfect solution, it certainly worked in a pinch.