Since(和後文無強烈的因果關係) I have the honor to hold our first class reunion, our team, including me and few other classmates,have finally decided how this party will go.
Firstly,considering that we girls are definitely going to get very wild and noisy, therefore(可刪) we choose to hold the party at the Cashbox KTV, next to our school rather than a high-class restaurant.
considering 後帶入原因 (會突然直覺做出老莫的動作，這也就是我覺得 therefore 可省略的原因，因為不省略的話，會沒有主要主詞，therefore 後帶入的是附屬子句，非主要子句)，說明為何選擇 Cashbox Ktv "rather than" high-class restaurant。
As to how the party will go, we have decided several games, including singing, of course,gift-ex-changing, and, most importantly, the girl chat. Also the date will be on July 10th, from 1pm to 5pm. The reason why we chose this date is that we think you girls might want to have some personal time with your family and friends, therefore we set the date on mid-July.
由 "you girls" 可知，這是ㄧ封類似公告的文章，也說明決定同學會日期的理由。( therefore 我覺得用的很好！)
That’s how our first reunion will go. Remember, it’s on July 10th, start from 1pm, and don’t be late. Also don’t forget to bring your little present.