Names. Names cause problems for me. I meet a LOT of people — like seriously, unless you're an outlier too, I meet new people more than you do. It's part of my job, and also fun. But every single person I know has a name! That I am supposed to remember!
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This btw is one of the extra jobs of small conference organizers. Not only do you meet more people than regular attendees, they have actually paid to come specifically to an event you’ve pulled together. Larger events can at least put impersonal staff in touchpoint roles.

