A person who goes to see an exhibition, show, or event. Slightly formal; often used in contexts like museums, galleries, or public displays.
The spectators at the exhibition were quietly viewing the works.
This museum welcomes many visitors each day.
見物人 is a casual term for sightseers or onlookers, whereas 観覧者 is more formal and specific to organized viewings.
Compound of 観覧 (viewing, inspection) + 者 (person). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese pattern for agent nouns.