By setting up a well-stocked buffet table and drink station, the party will essentially run itself. Everyone can serve themselves and you’ll also create a spot for them to mingle.
A good way to keep guests outside comfortably throughout the day and into the night is to provide ample supply of things like water, sunscreen, and bug spray. As night approaches, a few light blankets will help keep the chill away.
If you really want to be ‘entertaining’ you should consider bringing your sturdy, indoor utensils and dishes outside for the party instead of using disposable ones.