When using go-github, I'm finding myself doing this a lot:

repoNameComponents := strings.Split(*userEvent.Repo.Name, "/")
username := repoNameComponents[0]
repoName := repoNameComponents[1]

it would be nice if there were helper methods like Repo.Username() and Repo.Name() to make this easier.

Or maybe return both in a single call:

username, reponame := Repo.Details()

I'd be willing to put together a PR if this is something that would be likely to get merged.