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after Ron Weasley hit the high note in the song, the entire stadium stood up and applauded him

"After" should be capitalized, as it begins the sentence. "Ron Weasley" is properly capitalized because a name contains proper nouns.

"Stadium" does not have to be capitalized because the official name is not listed--if it were a specific stadium, it would have to be capitalized, but in this case the capitalization is correct.