Office Christmas parties are an American workplace tradition filled with eggnog, Secret Santa gifts and potlucks. But as workplaces change, so does the way workers celebrate across the nation. Innovative coworking space provider Galvanize recently polled start-ups, tech and marketing companies who call one of Galvanize’s six coworking communities home. Some interesting holiday tidbits including: Although the coworking companies surveyed were overwhelming tech-related ventures, 26 percent of the companies said they will still mail out Christmas cards to their clients. More than 57 percent of the respondents will celebrate at an offsite holiday party, 19 percent will embark on a team outing and 11…