The big picture: While Trump is scheduled to speak inside the BOK Center, additional staging is to be set up outside for other speakers and performers.

These speakers, performers and surrogates will appear both inside and outside the arena, and Trump plans to speak at both the indoor and outdoor stages, according to a source with direct knowledge of the plans.

The Trump campaign announced that more than 50 campaign surrogates plan to attend the Oklahoma rally, including at least a dozen Republican House members and Sens. Jim Inhofe, James Lankford and Tom Cotton.

The event will be expensive. But the campaign says it raised $14 million on Sunday by promoting the Tulsa rally as well as the president’s birthday.