Pull together all the quilts, blankets, pillows and chairs you can find - or says BYOB (own blanket! heehee). Nothing has to be fancy or matching, it's all in comfort and fun! Source
If you do want to get a little fancy... you can make these letters out of cardboard! How fun to greet your guests! Source and tutorial
Set up a fun station of drinks, popcorn and candy... I love this vintage example! Source
Make edible chocolate tickets for your favors! Source (buy mold here)