1．It's my honour to invite you to join us in a charity sale.
非常荣幸地邀请您与我们一起参加一次慈善义卖活动。
2．We are planning to hold a charity sale and we feel it a great idea if you can join us.
我们计划举行一次慈善义卖活动，如果你能来参加那就太好了。
3．The following are some details about this activity./Here are some details about this activity./Some details about this activity are as follows.
活动的细节如下。
4. (2017年全国卷Ⅱ书面表达)I'm Li Hua.I'm writing to invite you to see the Chinese papercutting exhibition.
我是李华，我写信是为了邀请你参观中国剪纸艺术展。
5. (2017年全国卷Ⅲ书面表达)I am Li Hua.I am writing to tell you some good news that the Student Table Tennis Team of our school is recruiting new members right now.
我是李华，我写信是为了告诉你，我们学校乒乓球队正在招收新队员的好消息。
6. (2017年全国卷Ⅲ书面表达)I would like to invite you to join, since you are good at table tennis，and you are the most suitable person.
我想邀请你参加，因为你擅长乒乓球，并且是最合适的人选。
