But for a child’s birthday party, one would invite guests from, say, 2 p.m. to 4 p.m., so parents know when to pick up their children. If I am hosting a cocktail ... on the invitation is fine ...

But for a child’s birthday party, one would invite guests from, say, 2 p.m. to 4 p.m., so parents know when to pick up their children. If I am hosting a cocktail ... on the invitation is fine ...