In Burnet, TX, they are reporting there are 30,000 out-of-area visitors for the eclipse. Many have set up tents, some with the intention of staying overnight. The city of Burnet has issued the warning this morning that as soon as the eclipse has taken place, they are to immediately leave the area. Weather forecasts are predicting high winds, with tornadoes and large hail being possible later today.
This could turn into a real nightmare for the observers there, even if they are back in their vehicles. Between the possible bad weather and traffic congestion leaving the area, I would be seriously considering whether to stick around.
Edit: I understand they were having a festival in Burnet, with the paid entertainment and food catering being cancelled by Burnet.