clearing plugin augroup

I'm trying to clear augroup events from a plugin that's useful, but has some annoying event bindings.

I can run autocmd! GROUP_NAME interactively, but when I try to do this in my .vimrc (or a local .vimrc) I get the error
E367: No such group:

I'm sure there's some arcane load ordering thing here, but it escapes me. I've tried:

* putting the augroup at the end of my .vimrc
* in a directory local .vimrc (I've enabled exrc)

Any advice?

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