Your b-day party sounds like it will be a total hit!! Some ideas for food could be...
~Tell your friends to bring a whole bunch of their favorite foods, not cooked, and make a specailty in cooking.
~Dirt cake! In a flower pot with flowers sticking out!!
If you still need help finding ideas and if you have intant messanger, talk to RecipeBuddie. Or maybe you could try to look up an idea online or in a cookbook! Good Luck!!!!