This is the 1728th most frequent Russian word.
выставке
"Выставке" means "exhibition" or "expo."
In this sentence, "выставке" is used in the locative (prepositional) case to denote a location where an event is taking place, specifically referring to an exhibition in the museum.
Мы побывали на выставке в музее.
We visited the exhibition at the museum.
Here, "выставке" again appears in the locative case. It is used to indicate the setting of an action, specifically where the works are displayed.
На выставке представлены работы известных художников.
Famous artists' works are displayed at the exhibition.
In this sentence, "выставке" is in the prepositional case and is used after the preposition "о" to specify the subject being discussed.