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How to write a formal invitation
Write out dates.
Regardless of the type of event you're inviting your guests to, you should use a formal writing style on a formal invitation. This means spelling out dates and other words that are usually abbreviated.
For example, you should write " saturday, the nineteenth of november " instead of " saturday, november 19th. " you should also write " 253212 boston street " instead of " 253212 boston st.