To find out how many people attended the circus show on Sunday, we can start with the number of attendees for each day:
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Friday: The number of people at the show on Friday is given as 410.
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Saturday: On Saturday, there were 263 more people than on Friday. So, we calculate the number of attendees for Saturday as follows:
\[ \text{Number of people on Saturday} = \text{Number of people on Friday} + 263 = 410 + 263 = 673 \]
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Sunday: On Sunday, there were 115 fewer people than on Saturday. Therefore, we calculate the number of attendees for Sunday:
\[ \text{Number of people on Sunday} = \text{Number of people on Saturday} - 115 = 673 - 115 = 558 \]
Thus, the number of people who attended the circus show on Sunday is \( \boxed{558} \).