One of my pet peeves is when there are a herd of guests waiting to be seated - they are all wandering around like they are waiting for a man to get on the PA System and them them what to do next. (So I usually run around and let people know to go ahead and take their seats the bride and groom will be joining us shortly).
This is of course when there aren't place cards, people just honestly don't understand open seating it seems. Is open seating all it's cracked up to be?
First you need more tables, because although you have tables of 8 or 10, people leave 1 or 2, sometimes 3 seats open, so you wind up needing more places for your guests to find a place for their tushies.
I am all in favor of printing large boards (32x24) foam - dry mounted... depending on how many guests, you can use 1 or 2 or 3... It can be done DIY and to have them printed can cost between $15-$20 and can be just a beautiful as you'd like...