Room Divider

Okay so my sister is having a party tonight. Her birthday is tomorrow and we are having a birthday dinner at my other sister's townhouse. There's a little area in the backyard that could be great to entertain in but there's no fence between the backyard and the neighbor's backyard. So....I thought it would be awesome to put up some kind of privacy fence hang lights on it and set up tables for everyone to eat outside! Totally awesome idea right?!
Okay, well let's just go to Target or somewhere and buy a room divider for about umm.....$30-$50! Sure, let's go.......... did you know......room dividers are $100 and up!!!! We would need like 4 for the backyard. That's like $400 for a ONE NIGHT dinner party! What in the world are we going to do?! I tried to find some kinda of makeshift room divider, but they all involve PVP and metal sheeting. I'm not looking for that kinda of makeshift. Maybe something like a sheet and string.....I don't know.
Oh, and I know there's a whole house inside, but there's no room for 15+ people. The other option is all of us to eat inside and all of us eat standing up. Yes, there is a kitchen table but the catering company will be using it to put their spread on it! So.....there will be no table to eat dinner on tonight! Okay what can we do?!!!!!! I guess I'll let you know what happens......