写英语派对环节作文时，可以遵循以下步骤和结构：

开头

简单介绍派对的类型、地点和时间。例如：“We had a birthday party at my house last Saturday.”

主体

描述派对的具体活动。可以按照时间顺序列出每项活动，并说明谁参与了这些活动以及活动的结果。例如：“First, we ate cake and ice cream. Then, we played games. Finally, we sang and danced.”

结尾

总结派对的感受和体验。例如：“The party was great. We had a good time.”

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My English Party

Last Saturday, I hosted an English party at my house. I invited all my friends and classmates to come over and join in the fun. The theme of the party was to speak only in English, no matter what!

First, we ate cake and ice cream. Then, we played games. I bought a watch as a gift for my friend Lucy, and we sang and danced together. She had many friends, so we played various games, and everyone had a great time. Finally, we watched a video and celebrated Lucy's birthday with her family.

The party was fantastic. Everyone had a good time, and we learned a lot by speaking only in English. I hope to have more English parties in the future.

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通过以上步骤和示例，你可以写出一篇结构清晰、内容丰富的英语派对环节作文。记得使用一般过去时态来描述已经发生的事情，并尽量运用所学的词汇和表达方式。