The ones I've heard most often is "a convention of nerds" or "an awkward of nerds", but I've always preferred "a zoo of nerds".

[how's that for nerd cred: he knows and employs the origin of the term 'nerd'. he is looking down at the application again, though. references... he's pretty sure Tony would give him a reference. could he ask Fury for one? why is he even thinking this through]