We're having a Sunday brunch wedding with afternoon tea, and the entire event will be from 11am-6pm. Bar will open from 11:45am-5:45pm. We will be having ~175 guests, probably ~160 of which will have a drink (or more, knowing my friends and his family). I'm trying to plan how much beer, wine, champagne, and vodka to buy. The drink list will be: 3 types of beer (we're craft brew fanatics), one white wine, one red wine, mimosas, Bellinis, just straight champagne, bloody mary's, screwdrivers, and any other vodka juice drink people want.
I was thinking of doing the following calculation: 2 drinks/first hour then 1 drink/hour after, for a total of 1120 drinks needed. I was thinking of dividing the number of drinks by 4 for the 4 types of alcohol I'll be buying. Does that make sense, or do I need to skew one type more heavily (perhaps more champagne than wine etc.)? Is that way too much alcohol for a daytime Sunday wedding?