Liquor/beer/wine being served? You may need to provide a bartender and get a liquor license or variance from the local government for this. Be very, very careful as you maybe responsible if someone gets drunk and drives and has an accident as they look at it that you provided the alcohol.
Sounds like a good way to make extra money, but I would check with your insurance company to see what they cover in case of damage, etc. You may have to revisit your policy and upgrade it to cover this new "business".
Lots to consider...