Well ok it's winter, hmmm, do you have a big yard? if not can you access a Big Yard?
Ok here is the plan. do a big ass fire outside, so people can be warm and still be outside, no need for a cooler the snow will be keeping your drinks cold. Make a Bar out of snow and put water on it so it ice up, you'll need chairs or benchs. You can use a BBQ outside in the winter if you didn't know...
Make it a winter wonderland, snow is cheap
