英文邀请函怎么写呀?请写一份邀请函,邀请你的老同学参加你们学校的100周年校庆晚会.请具体说明晚会的时间、地点、以及晚会的主要内容和参加者.不得少于80字.

五种常用的邀请信一、Dear sir/madam: Im delighted you have accepted our invitation to speak at the Conference in [city] on [date]. As we agreed, youll be speaking on the topic "" from [time]...