Hi nbuckland,
I’m sorry to hear the update to 3.8 breaks your site. We do try to stick to one issue per thread though, so let’s deal with the initial question you asked in this thread – but of course please don’t hesitate to create a new thread for any 3.8-related issues, one of the team will be only too happy to help.
Is there some way to view a list of previously attended events for a specific user? I teach hundreds of classes per year and I would like to view a user’s profile to see a list of classes he’s attended without having to look through all the attendee lists.
No purpose-built functionality exists for this, but it would certainly be possible to build a custom component that implements this (that would however be sufficiently complex as to be out of the scope of what we can help you with here on the forums).
I can definitely see the potential for this sort of functionality and would encourage you to post a feature request – doing so allows others to up-vote and comment on the idea, giving us a really good sense of how many people might need this.
Does that answer your question?