концертную

концертную

"Concert" (adjective form, related to concert).

Here, 'концертную' describes the type of program, indicating that it is concert-related.

Мы купили билеты на концертную программу.

We bought tickets for the concert program.

In this case, 'концертную' modifies the noun 'аппаратура,' referring to equipment used in concerts.

Орchestra возит концертную аппаратуру для выступлений.

The orchestra carries concert equipment for performances.

Here, 'концертную' qualifies 'деятельность,' implying activities related to concerts.

Концертную деятельность артиста прекратили на время пандемии.

The artist's concert activities were suspended during the pandemic.