This article will help you write invitations that grab attention and make people want to attend your event. The most important information to include on party invitations is the location, date, and time of the event.Polite Subject Line: Use a clear and respectful subject line, such as "Follow-Up: Request for Meeting. We have curated 15 different templates for invitation letters that can help you write invitation letters with ease. Clearly state what you are inviting the recipient to do and why it is important. Begin with a Polite Greeting. For a formal letter invitation, it's best to explicitly point out the purpose, event goals, and the value it can bring to participants.