Viewing or attending an exhibition or performance (to view). '観覧する' is used for museums, exhibitions, fireworks, etc.
美術館で印象派の絵画を観覧した。
I viewed Impressionist paintings at the art museum.
展覧会は無料で観覧できる日がある。
There are days when the exhibition can be viewed for free.
開館時間内に展示を観覧してください。
Please view the exhibits during opening hours.