Republican convention planners appear to have a surprise planned for those tuning in Thursday night.

Buried deep in the convention schedule released Monday is a vague reference to a mystery speaker scheduled for the event’s final evening. “To Be Announced” has a prime speaking slot late in the Thursday program.

By then, speakers from Mitt Romney’s church will have taken the stage that night. The co-founder of Staples office-supply chain will have spoken about working with Mr. Romney during his time at Bain Capital. State officials from Massachusetts will have talked about the former governor. Olympians will have already thanked the presidential candidate for leading the 2002 Winter Games.

The only other speakers to follow “To Be Announced” will be Sen. Marco Rubio of Florida and Mr. Romney himself, suggesting that the unnamed guest may appear during the 10 p.m. hour when the networks all will be broadcasting the convention.

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