exhibition hall; exhibition room; exhibition area
A dedicated space for displaying items, such as in a museum, trade show, or gallery.
A painting exhibition is being held in the new exhibition hall.
I bought a ticket at the entrance of the exhibition area.
展示場 refers specifically to an exhibition hall, whereas a コンベンションセンター can include exhibition space but also hosts conferences and other events.
展示場 plainly means an exhibition hall, while メッセ carries the same venue meaning but is often used as part of a facility's proper name.
Compound of 展示 (tenji, 'exhibition') + 場 (jō, 'place').