How To Write A Letter To Make Someone A Patron . Letter to make someone a patron my contact`s birthday shows up in the calendar as an event. Hi, i need a sample letter on inviting someone to be a patron of a charity organization.if you have. Memories of the HandWritten Letter HuffPost from www.huffingtonpost.com A typical sponsorship letter uses the format seen in many business letters. Dear [mention the full name of the recipient], i am writing this letter to invite you to an event organized by our organization (mention the name of the organization) as a patron. Start by making a list of the strengths which you would like to convey in your recommendation.