An invitation to a chief guest should describe the nature of the event as well as the guest's role at the function. It should include the date, time and location of the function and give a deadline for a response as well as contact information. If the guest is to be honored at the event, the letter should include a description of the award or citation.
The invitation should convey warmth and appreciation for the guest of honor while reflecting the values and culture of the organization hosting the function. For a serious event, the tone of the letter should be formal and avoid slang.
To invite a speaker to a business or professional event, type the letter on corporate or organizational letterhead. The first paragraph can include details about the event and the topic to be addressed by the speaker. Subsequent paragraphs can describe the objectives of the event and why this person was chosen as guest speaker. The letter should also mention an honorarium if one is offered and whether the inviting organization intends to reimburse the guest's expenses for travel, lodging and meals. A guest speaker may also be invited to a private dinner or reception for key members of the organization hosting the event.