The three things to include on the invitation:
When they’ll be eating. Avoid refiring the grill for latecomers with something like “The grill master will be slinging grub from 6 to 7. Come and get it!”
Attire. Everyone (OK, every woman) is wondering what to wear. Tank top? Sundress? Give guests a sense of the vibe: “You wear the flip-flops; we’ll flip the burgers” or “Bring your swimsuits!”
Rain plans. “I don’t think you need a rain date unless it’s a 600-person church picnic,” says Clark. “A 30-person barbecue at my house is going to happen no matter what.” But if you want to clarify, add a note: “Rain or shine.” Or “If it rains…game night inside!” Just be sure that you have room for everyone in your living room.