Picture the scene: It’s a late afternoon in the House, pushing early evening, and debate over a bill is nearing its end. Now, it’s time to vote, but a few members pipe up to request a roll call.

The ceremonial roll call included a live performance by Lil Jon of Georgia. Florida played "I Won't Back Down" by the late Tom Petty. "Giddy up," said a delegate from Colorado.

The roll call will take place during Tuesday’s session at the convention, and while the votes won’t be binding, the event is being billed as an experience “felt arena-wide” by delegates ...