"Engagement plan" is the most common way to refer to a plan for getting engaged in Engpsh. This term comes from the verb "to engage," which means to make a commitment or agreement to do something, often with the intention of getting married.

Here are some example sentences using this term:

"We've been discussing our engagement plan and have decided to get married next summer."

(我们一直在讨论订婚方案，决定明年夏天结婚。)

"I'm so excited to hear about your engagement plan! How did he propose?"

(我很高兴听到你们的订婚方案！他是怎么求婚的？)

"We spent months planning our engagement and working on our engagement plan before finally getting engaged."

(我们花了几个月的时间计划订婚，并且在最终订婚之前一直在制定订婚方案。)