I pulled up Adobe Illustrator and was about to dive into making a seating chart, but Googled to get some ideas. Most of what I saw were organized according to table, but I saw a couple that were organized according to the couple's surname. FH thinks the latter would be better; I think the former, as it's cleaner. One thing I should note is that our table aren't numbered; they're named according to constellations.
Thanks!