You've established an awesome foothold on a great thing at the office. So don't blow! Nothing will ruin a perfectly good party (and job) than a terribly behaved date. If you're thinking of inviting that fun albeit obnoxiously alcoholic pal, think twice. Your coworkers (and boss, even worse) will judge you on the people you keep company with. And before you go, prep your date: ask him or her to keep the office politics and gossip quiet.