The only thing the page says is “No Tickets Available.” It could say a lot more.
The National Museum of African American History and Culture (NMAAHC) is very popular. Getting to go requires securing a pass, either by booking in advance, or by getting same-day passes starting at 6:30 AM. If you go to the page at 6:25 AM, you see this:

The only information given is “No Tickets Available.” Does that mean:
There’s no way to know, and nothing to do but manually refresh the page. As it turned out, the answer was (3), and the page eventually (around 6:34) refreshed to display a choice of times to arrive. A better display for this page, in descending order of user-friendliness would be:
Note that option (4) doesn’t require any code change, just a better product choice about the text to display.