No, "attendees" does not have an apostrophe. "Attendees" is the plural form of "attendee" and is used to describe people who are present at an event or gathering.
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Church attendees are often referred to as the or a
congregation.
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Baseball in the USA and Canada have the most attendees in the
world with 74,026,895 attending games annually. The second most
sporting attendees is baseball in Japan with
22,047,491attendees.