Twenty candidates will speak over the next few days after that — six Friday, nine Saturday and five Sunday. There will be one speaker each Aug. 13 and 17. The dates and times of speakers is subject to change.

Trump has not accepted the Des Moines Register’s invitation to speak from its soapbox. So the lone Republican in the lineup will be Bill Weld, former GOP governor of Massachusetts and the vice presidential candidate of the Libertarian Party in 2016. This time he is challenging Trump for the GOP nomination. It will be his first campaign visit to Iowa.

Trump’s visit in 2015 may have set a bar few candidates are likely to clear. He arrived in his personal helicopter, which took children for a flight as he spent about 30 minutes at the fair.

Attendance that day, which was the same day rivals Hillary Clinton and Vermont Sen. Bernie Sanders visited, set a State Fair record. However, fair manager Gary Slater said favorable weather may have had as much to do with attendance as the politicians. That year, the fair drew 1.12 million visitors.

Kaufmann and Price both recommend candidates do the soapbox.

“I like to see them be at the State Fair, but just being at the fair won’t get you as much press coverage as being on the soapbox,” Kaufmann said.