70s and 80s is still “summerlike” weather, so chances are good that for the Cocktail Hour you’ll see a lot of Blush & Whites being wanted (Blush more so if this is an American Wedding… in which case White Zin which is a Blush wine, is the 3rd largest wine sold in the USA)
Even many of the red wine drinkers (like myself) will start the Cocktail Hour off with a lighter crisper White Wine, and switch to Red for Dinner.
I know I am a big Wine Drinker at social events… including Weddings (something about a party). Mr TTR is a Wine Snob for sure, as he is working on his Sommelier Certification for his Retirement… so my wine habits have rubbed off from him. In which case we both drink probably more wine than average…
For myself, you could expect me to arrive at your Reception, head to the Cocktail Bar and make my first drink dependent on what choices there were. If you are having a nice Signature Cocktail, I’d probably go with that. If not, it’ll be a Crisp White Wine (Sauvignon Blanc or Pinot Grigio preferred)
At Dinner, more than likely I’m going to have Red Wine (unless you have both Red & White Carafes on the tables… in which case with my Salad / Appy I’ll be reaching for the White). Red for my main course (and hopefully it will be a medium to full bodied red… Merlot, Pinot Noir, or a nice Red Zin, or Cabernet Sauvignon)
So By the end of the Cocktail Hour, I’ve had = 1 White
By the end of Dinner, I’ve had = 1 White & somewhere between 1 and 2 Reds
Total = 3 to 4 Glasses in probably 3 Hours
The Consumption Rate you’ll find advertised for Weddings & Social Gatherings is 1-1/2 Drinks per hour.
So my guesstimate above, is a bit under the norm.
But then again I admit, that if the day is hot, the service long, or the AC isn’t the best in your Reception area, at the Cocktail Hour, that first cold crisp white will go down ever so quickly, and I may end up having 2 (Bringing my 3 Hour Total to 4 to 5 which is right on the money with the Consumption Guides)
Rest of the night ???
I probably will hardly drink at all. Even here in Canada where the Reception Dance typically runs for many hours… say 8 to 2 (6 more hours)
More than likely you’ll find me having switched to Bottled Water, Pop or Coffee for the rest of the night, maybe a few nibbles to accompany them if you have any sort of late night eats.
I purposely have stopped drinking because altho I like to party, I also like to be able not to have a hang-over… I need to function the next day. And I may even be the person needed to drive us back to the Hotel. So a 6 hour gap with no alcohol is important to me.
What your Guests will do, is hard to determine (which is why the books all say allow for the 1.5 drinks an hour consumption I suppose)
By 2 AM… I’ll pretty much be tired, and just wanting to head off to bed. Having had a good time at your wonderful Wedding.
Hope this helps
EDIT TO ADD – More people drink White than Red normally, especially so if it is a younger crowd (Palate development). And on a hot day more drink Blush or White than Reds also.
You’ll get aprox 5 “standard” pours out of every 750 Ml bottle of wine.. (5 x 5 ouces). So someone like me, someone who’s drink of choice is going to be wine vs beer or cocktails, is going to come in around 5 Drinks = 1 Bottle.
Find out what the arrangement is with your Venue. Can you order wine on spec… anotherwords can you only pay for those that are opened and then the venue returns the rest… OR do you have to pay upfront for everything poured or not. That will make a HUGE difference in the calculations for your Wine Order !!