在雅思口语中描述参加的聚会，你可以按照以下结构来进行：

When and where the party was held （聚会的时间和地点）

例如："I attended a party last weekend at my friend's house."

What kind of party it was （聚会是什么样的）

例如："It was a birthday party with lots of fun games and food."

What you did in the party （你在聚会上做了什么）

例如："I played games, chatted with friends, and enjoyed the music."

And how you felt about the party （你对聚会的感受）

例如："I had a great time and it was really enjoyable."

结合以上结构，一个完整的描述可能是：

"I attended a party last weekend at my friend's house. It was a birthday party with lots of fun games and food. I played games, chatted with friends, and enjoyed the music. I had a great time and it was really enjoyable."

希望这能帮助你准备雅思口语考试中的相关话题