Approaching a small group at a conference and asking "What am I interrupting?" is a great way to join a conversation without being awkward, David Spark writes. A straightforward "Can I join you?" also works, he writes, while noting that one of the worst things you can do is ask "How can I help you?" right away. "It's bogus. Avoid it and avoid the person who asked the question way too early," Spark writes.
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