New Orleans is celebrating its 300th birthday in 2018 when the Manuscript Society travels down the Mighty Mississippi for its 2018 Annual Meeting. Alfred Lemmon, chairman of the planning committee is preparing a special trip including access to early French, Spanish and American documents held in The Historic New Orleans Collection. While the schedule is still being finalized you can be assured that y'all will want to set aside April 18 - April 22, 2018 for history, food and music…