A friend of mine is about to appear in a play called The Cat's Meow, about goings-on on William Randolph Hearst's yacht of that name in 1924. You may have seen the 2002 movie with Kirsten Dunst, Cary Elwes et al.
On opening night it's been suggested they have cocktails available, and it makes sense to me to have at least some of them appropriate to the era.
A quick troll around eG and elsewhere suggests the Twelve Mile Limit and the Scofflaw. What else would you suggest? If I'm making them, as I fear I'll be roped in to do, simplicity would be nice - I'm not a professional by any means; I can take 10 minutes to make something interesting at home, but I don't think that would fly for a thirsty queue. Another consideration is that many/most of the audience probably won't be used to full-power spirits, so if one or two lower alcohol ones (unlikely as that sounds for a Prohibition cocktail!) come to mind it would be useful.
Let's see your drinks.