GoMom

This weekend we are having my daughter's graduation party. We're expecting about 150 over a couple of hours of open house, many of these are people I've never met. My daughter is my step-daughter and has bravely chosen to have one grad party which all sides must attend. That means parents, step-parents, and all relating relations. For the most part, we all get along very well, but this is the first really big she-bang with all bodies present. Do y'all have any tips or tricks as to how I can make sure that the party doesn't split down the midle along family lines? Any smart ways to handle awkward relatives, beyond the healthy pours of booze that I'll be providing?