yes, maybe “showgrounds” can be agreed on for such as the one I described, because these other fairgrounds you mention are also quite common in Germany, some examples of different kind of fairgrounds with notable infrastructure (exposition halls):

https://www.luftbildsuche.de/info/luftbilder/das-messegelaende-hannover-niedersachsen-343222.html
https://www.hotelier.de/1200/bilder/news/foto/Leipziger-Messe.-800.jpg

Just that you will not find them in smaller towns. (i.e. there are only few of these, but they are well known and important)

Cheers,
Martin

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