456, X Street, Y Avenue
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear ANDREW HALL,
The time has come for us to go green! We cordially invite all our Irish fellows to the yearly St. Patrick’s Day. The parade will start at noon on March 17. It will be starting from 1200 Main Street and will go up to Oak Street. There, dinner will be served to all the attendees. The dance will commence at 7:00 p.m. People of all ages are invited.