You cannot cook the food, serve drinks, pick up empty glasses, clean up spills, put music on the stereo and still be the congenial host and introduce your friends and neighbors. If you try to do it all, you won’t have any fun at all! Don’t be up to your elbows in watermelon balls when the doorbell rings. GET HELP!
Whether you recruit a friend or hire someone ask them to come early and give them instructions. Give them a quick tour of the house, including where to put gifts. Make your expectations clear ahead of time.
In addition to having someone help in the kitchen, ask an outgoing person to take photos. Many parents complain that they forgot to take photographs during their party.

Give your helpers a thank you gift. My sister-in-law gave me a photo of the grad party kitchen crew (we had a great time!) and a flowering plant for my garden. One of our friends who served a Mexican taco bar with the help of two neighbors thanked them with these chili pepper aprons. Something thoughtfully tied to the event is especially appreciated. A gift certificate to a nice local restaurant would also be appropriate.