For my first cocktail party with about 50 guests, I provided a full bar so that people could mix up their favorite drinks, but I came to the realization that most of my friends were so used to beer and wine at parties that they had no idea what to do when faced with so many choices. In parties that have followed, I simplified things by providing two or three different cocktails in pitchers. But that is for a large cocktail party. What you have going is another story all together and I think wine/beer/sangria/interesting soft drinks would be more than enough in the way of libations for this marathon event. Got to keep your crew on their feet. My recommendation is to enjoy your well deserved cocktails after this incredible meal (and before the orgasmic burgers). Happy Birthday!