Looks like asking people at a business event what they do for a living might not be the best way to build rapport. In fact, it may be best to avoid talking about work entirely. "But what else can we talk about?" you ask. Well, read on for some suggestions…
Assuming you’re already at a work-related networking event or meeting another person in a work context, the question quickly sets a boundary around the conversation that the other person is now a “work” contact. It’s possible you might discover another commonality and build a multiplex tie, but it’s far less likely to happen in that conversation.
https://hbr.org/2018/01/8-questions-to-ask-someone-other-than-what-do-you-do