Church Event Invitation Template for Honored Guests. Interview Invitation With a Request to Sign Up Online.Looking for the right way to invite new people to your church? Click here for a guide complete with free church invitation letter samples. You should include the name of the host, formal expression, the event purpose, date, time, and venue, contact details, and RSVP. Please fill out the following form in its entirety. We will review your request and follow up with you as soon as possible. This means spelling out dates and other words that are usually abbreviated. What should the letter say? Sample Invitation Letter. Description.