I'm throwing a party for an author whose new book is a political and culture history of early 1970s America. We will be offering beer and wine, but I want to add one or two fixed cocktails (rather than having an open, full bar). I've thought of amaretto sour, Harvey Wallbanger, or tequila sunrise, but those all feel very fruity and sweet to me and I'd like to have one option that's a little different and drier. Thoughts? The party is at a hotel where the bartender will have access to whatever we can think up, probably.