This is the 2113th most frequent Russian word.
севастополе
"Севастополе" is the prepositional case form of "Севастополь," meaning "in Sevastopol," a city in Crimea.
The word 'Севастополе' here is used to express the location where the action of the sentence occurred, in its prepositional case as dictated by the preposition 'в'.
Я был в Севастополе прошлым летом.
I was in Sevastopol last summer.
In this sentence, 'Севастополе' is again in the prepositional case to describe the location associated with 'музеи' (museums).
Музеи в Севастополе действительно впечатляют.
The museums in Sevastopol are truly impressive.
Here, 'Севастополе' serves the same case function, providing the location of future events described by the verb 'состоятся'.