Here's a basic list of things that you may want to think about bringing to the party:
[*]A blanket or large tablecloth-if the grass may be damp, bring a plastic tarp, too
[*]Napkins
[*]Baby wipes (or a few damp washcloths in plastic bags)
[*]Paper plates, plastic cups and plastic utensils (why spoil the fun washing dishes or worrying about breaking glassware?)
[*]A manual can opener
[*]A corkscrew
[*]A small cutting board and knife
[*]Aluminum foil
[*]plastic zipper storage bags for leftovers
[*]Hand sanitizer
[*]Two ice chests or picnic coolers: one for beverages; one for perishable foods
[*]Ice
[*]Bottled water
[*]Beverages
[*]Condiments
[*]Extra garbage bags for clean-up
[*]Matches or a lighter
[*]Swimsuit and a change of clothes
[*]Towel
[*]Sunscreen and/or a hat & sunglasses
[*]Insect repellent
[*]A small first aid kit
[*]Games or toys
[*]A flashlight
[*]A portable radio
[*]Sweater or windbreakers and long pants
[*]Umbrella (if you got it, you won't need it, so be sure to bring one along)