The simplest answer is 10 750mL bottles.
A more complete answer depends on several factors.
Are the people heavy drinkers, or are many of them teetotalers? There are several variances in between, and if your crowd is the classy wino type, you'll need more.
What selection of wine are you making available? If there are more options, people may want to try more, so you'll need more wine.
Just like when you have more than one dinner selection at a buffet, you have more food than if you're only serving one entree. You can even have the wine selections set up to be proportional to the food selection.
What kind of food will be served and in what atmosphere? Obviously, if wine is the focus, you will need more. If food is the focus, you would need less wine. Sit downs tend to be more conducive to wine drinking.
The length of the event will also play a role. People will drink more at a 5 hour party than they would at a half hour cocktail event.
What kind of wine are you serving? If the wine is expensive, your guests may be satisfied with a more moderate amount.
Hope this helps!
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