How does this sound?

We bring our own shade and tables(we will take care of that) and if everyone could bring a lawn chair they could use, or blankets to sit on.

As far as food. My mom and I are willing to get all the food. We'll do a meat/cheese platter with rolls, fruits or veggies, chips, drinks and some cookies. We will figure out the cost of everything and divide it by person.

We could plan to have lunch around noon. We will be there early to set up and get food. So people can come when they want and leave when they want.