Like all the business letters, the professional invitation should be written in a formal tone.
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It’s rude to mention the date on which the receiver of the letter should provide his or her reply.
The first word of a complimentary close should be capitalized.
Casual words and slang as well as the light, conversational tone should be avoided in a business letter.
Personal pronouns “I” and “we” have the same meaning when writing a business letter.