I urgently need an English invitation letter to invite others to the meeting.

Dear sir,

We'd like to invite you as our guest speaker to attend the [annual meeting] to be held in our company [conference room] at 8: 00 am on Saturday, May 25th, 20 10.

As you know, our department is very interested in [20th century English literature], because you are familiar with this field, and we know that your views will interest us very much.

You will receive further details later, but we would appreciate it if you could accept it as soon as possible so that we can finish our agenda.

cordially

Invited translation:

Dear sir,

We'd like to invite you to be our special speaker at the [annual meeting] held in our company [conference room] on Saturday, May 25th, 20 10.

As you know, the department is interested in [20th century English literature], because you are familiar with this field, and we know that your views are very interested in us.

You will receive more detailed information later, but we hope you can accept it as soon as possible so that we can complete the agenda.