We love entertaining in the warm weather months. The sun never seems to set so there is plenty of time for kids to play and adults to talk. We love this idea we found over at Stitch/Craft to throw an ice cream party.
Go to the market and buy one of every flavor of ice cream you see. Set out some toppings - like sprinkles, crumbled cookies, fruit, and chocolate syrup and you're set. You could also do a variation on the theme with popsicles and/or sorbet.