specially arranged venue; site prepared for an event
Refers to a room, hall, or area that is set up specifically for a particular meeting, exhibition, or event, rather than a permanent facility.
A special venue was set up for the exhibition.
The new product announcement will take place at the specially arranged venue.
会場 is a general term for any venue or meeting place, while 特設会場 emphasizes that the space has been specially prepared or temporarily arranged for a specific purpose.
Compound of 特設 (とくせつ, 'special establishment') and 会場 (かいじょう, 'meeting place'). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.