Figuring out seating arrangements can be a huge pain the butt, and not mention having to deal with every ones suggestions as to who sits where, and don't bother drawing pictures of tables with every ones name on the table, I guarantee by the time you are done you will have scribbled out so many names that your seating chart now looks like a Picasso painting!
I have a tip that can save you time. Here's what you do: purchase mini post-its and write each guests name on an individual post-it, then gather as many paper plates as there are tables for your event. Number the plates as you would the tables at your event and begin sticking each guest (post-it) to their corresponding table. If you need to move someone, just move the post-it, it's that simple. No scribbled mess and they stack nicely out of the way when you are not using them.