The Exotic Teapot

I like your concept. Here are my ideas:

While at the party assign the teenagers, as a group, to come up with three or four fun games that all of you can participate in. You could encourage your daughter to be the hostess of the discussion.

Since teens can be picky eaters, ask each mum in advance what they will eat; hence preparing your menu based on the answers.

Only require that each mother-daughter come in costume as one theme. This gives them each the freedom to express their family individuality and preferences.