Event identifies the actual type of Event that occurred. Possible values are:
closed The Actor closed the issue. If the issue was closed by commit message, CommitID holds the SHA1 hash of the commit. merged The Actor merged into master a branch containing a commit mentioning the issue. CommitID holds the SHA1 of the merge commit. referenced The Actor committed to master a commit mentioning the issue in its commit message. CommitID holds the SHA1 of the commit. reopened, locked, unlocked The Actor did that to the issue. renamed The Actor changed the issue title from Rename.From to Rename.To. mentioned Someone unspecified @mentioned the Actor [sic] in an issue comment body. assigned, unassigned The Actor assigned the issue to or removed the assignment from the Assignee. labeled, unlabeled The Actor added or removed the Label from the issue. milestoned, demilestoned The Actor added or removed the issue from the Milestone. subscribed, unsubscribed The Actor subscribed to or unsubscribed from notifications for an issue. head_ref_deleted, head_ref_restored The pull request’s branch was deleted or restored.