Yes you can make reservations. Make sure with that many people that you do it 4-5 days earlier. Go on line for menu choices or ask when you call.
You can reserve for large group . Dont know if they have enough space for 50 people through. You can find the menu online. And cost per person varies based on what person order. If its dinner i think most of the meal are some where between 15-20$. You can also get unlimited soup or salad which is something all Olive Garden restaurant do
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