Track your friends at MangoCon
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May be an useful option!
ConFOMO is a simple tool that makes it easy to track your friends at conferences.
With ConFOMO, you don't have to fear missing out; you can make a plan of friends you want to meet at a conference you're going to attend, track people you met at the conference, and even let your friends (new or old) "introduce" themselves to your ConFOMO list.