毎年、浜松で凧揚げ大会が開かれる。

、。

Every year a kite-flying festival is held in Hamamatsu.

Literal

Every-year, Hamamatsu [at-で] kite-lifting-contest [subject-が] is-opened.

浜松 is a city in Shizuoka Prefecture famous for its annual 凧揚げ大会 ('kite-flying festival'). 開かれる is the passive of 開く ('to open [intransitive]') or 開く ('to hold [event]') — here 'is held.' An example of real-world cultural knowledge embedded in the sentence.