Seating a table well can make the difference between a really fun afternoon and one that falls flat. Because the mood of this shindig is definitely casual, arranged seating will be a fun surprise that encourages guests to make new friends and engage in interesting conversation with people they might not talk with otherwise. Set up picnic tables in the center of the yard and top with white paper runners. Arrange bunches of yellow and orange gerber daises in old jelly jars. use disposable bamboo utensils and plates to set the table—they’re a step up from paper dishes and easy on the environment ($35 for a pack of 25 [11-inch] plates, plumparty.com). Place yellow, green and orange bandanas for napkins on top of the plates. write the name of each guest on a lemon, lime or orange and place on top of the bandana napkin. For the kids, spread picnic blankets out on the lawn and let them mingle and make a mess—sans a lot of adult supervision.