This Christmas season, there are all sorts of holiday parties you may attend. But if you're required to bust out the tacky Santa sweaters, sip on a Prohibition-era cocktail, and munch on a gingerbread 'stache cookie, chances are you're at a hipster X-mas party. Let these 16 signs be your guide, and when in doubt, remember a hipster's trifecta: mason jars, craft beer, and artisanal cheese.