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John Heubusch, the library’s executive director, noted that private donors picked up the entire tab for the centennial celebration. The largest contribution was the $15 million from General Electric, for whom Reagan worked as a commercial pitchman in his career before politics.

The only incongruity over the weekend was the sight of construction workers erecting an enormous tent for the ceremonies, even though weather was picture-perfect, sunny and warm with a slight breeze.

Why the tent? “It’s been raining here for weeks, so I said we’ve got to have the tent,” Mr. Heubusch said. “You never know.”

As President Reagan liked to say, “Trust but verify.”