canopy tent       
noun [ C ] US uk/ˈkæn.ə.pi ˌtent/ us/ˈkæn.ə.pi ˌtent/ (UK gazebo)
 天蓬帐篷,尤指在室外空地办聚会时用的旁边张开的临时性大帐篷
a tent or temporary structure with open sides, used especially for events held outside
  For the graduation party they put up a canopy tent on the lawn. 为办毕业派对,他们在草坪上搭起了一个天篷帐篷。 
 Synonym: party tent
 - More examples
 - The restaurants lining the Old Town Square were prepared for the rainy, chilly conditions with space heaters and canopy tents.
 - Decorative candles sparked a fire which destroyed a canopy tent.
 - Canapes on silver trays were handed around under the canopy tent.
 - The kindergarten is currently housed in big white canopy tent stocked with toys, games, and books.