Just in case:

Link to tweet

Find a diner? Mill around outside the fairgrounds?

Why wouldn't they just stay open for their comfort instead of forcing them to find a place to go for now?

They don’t want people dropping dead of heat exhaustion. They probably don’t have the free water and cooling stations available yet at the fair. Most people at the fair won’t have cars to go back to since the bulk of them probably took Metro. There are lots of places to eat around there, but attendees may not want or need to eat. I think the museums are still open today and there are plenty of them to see; that would be my first choice.

... “By the way, on July 4th, it’s going to be approximately 107 degrees out, and I’m going to go, and I’m going to make a really long speech just to show that I can do anything,” Trump said ... https://thehill.com/homenews/administration/5950451-july-4th-trump-rally-heat/

There was no way in hell Trump planned to give a two hour speech iat 107 degrees on a ramshackle stage that's likely to kill somebody

If you're really planning a huge event on the mall in July, you organize adequate food, water, medical response, toilets ...

If you're just pretending to organize a huge event, you don't organize adequate food, water, medical response, toilets ... you just cancel at the last minute "due to the heat"

Grifters will grift