Would it be ok if I bought these food items on Wednesday evening for a dinner party on Saturday during the day?!
Meats should be eaten (obviously - cooked to the temperature shown on the package) within about 3 days of buying them - assuming they are kept cold the entire time in the refrigerator. The veggies should be kept in the refrigerator, also, and should be fine as long as they weren't already too old when you originally bought them. DON'T leave them in a bag when storing them unless it's one of those green produce bags and the produce isn't damp. Have a fun party!
School of hard knocks and http://www.ag.ndsu.edu/pubs/yf/foods/fn579-2.htm#Fresh
They would probably be ok. But you wanna purchase the freshest meats. Because some places use and or sell by date is close to when you purchase it. Check for this and good luck.
I would wait until Friday if possible