Like the invitation from a friend:
Starting Time: Six in the evening
What's on the menu: A surprise or two
What's the attire: Anything but shoes
What to bring: Just fabulous you(and, perhaps, a guest).
Gift policy: Absolutely no gifts, thank you, please, unless it's killing you in which case it must be eminently perishable, e.g. plant, flower, edible treat or liquor.