large outdoor theater {amphitheater}.
large sports or theatrical-event building {arena}.
Clamshell-shaped enclosures {band shell} can be behind outdoor stages.
Stages can have semispherical backdrops {clamshell}|.
ancient large arena {coliseum}.
dance hall {discotheque}.
horse-show arena {hippodrome}.
large roofless sports arena {stadium}.
Theaters {theater-in-the-round} can have stage in middle, with seats all around.
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Date Modified: 2022.0225