According to this editorial from BizBash, New Yorkers are still lighting up at private events now that the city has banned smoking. Says the article, "'Private events spaces are not subject to the bar laws,' said one event manager in the publishing industry. Wrong answer. In fact, it doesn't matter if the space is public or private. What matters is whether paid employees are there. The law was implemented with their lungs in mind."
Even tents can't serve as ad hoc smoking lounges, it says, adding that some planners are renting out bits of adjacent parking lots as "smoking patios." How do you handle the would-be smokers in your group?