step 1) mass email announcing lan party step 2) sit back while everyone sets it up step 3(optional)) provide mountain dews baby step 4) have a lan party ste

step 1) mass email announcing lan party step 2) sit back while everyone sets it up step 3(optional)) provide mountain dews baby step 4) have a lan party step 5) realize that OP asked about an offline lan, not an office lan.