`commit_comment` | Any time a Commit is commented on.

`create` | Any time a Branch or Tag is created.

`delete` | Any time a Branch or Tag is deleted.

`deployment` | Any time a Repository has a new deployment created from the API.

`deployment_status` | Any time a deployment for a Repository has a status update from the API.

`fork` | Any time a Repository is forked.

`gollum` | Any time a Wiki page is updated.

`issue_comment` | Any time an Issue or Pull Request is [commented](/v3/issues/comments/) on.

`issues` | Any time an Issue is assigned, unassigned, labeled, unlabeled, opened, closed, or reopened.

`member` | Any time a User is added as a collaborator to a non-Organization Repository.

`membership` | Any time a User is added or removed from a team. **Organization hooks only**.

`page_build` | Any time a Pages site is built or results in a failed build.

`public` | Any time a Repository changes from private to public.

`pull_request_review_comment` | Any time a [comment is created on a portion of the unified diff](/v3/pulls/comments) of a pull request (the Files Changed tab).

`pull_request` | Any time a Pull Request is assigned, unassigned, labeled, unlabeled, opened, closed, reopened, or synchronized (updated due to a new push in the branch that the pull request is tracking).

`push` | Any Git push to a Repository, including editing tags or branches. Commits via API actions that update references are also counted. **This is the default event.**

`repository` | Any time a Repository is created. **Organization hooks only**.

`release` | Any time a Release is published in a Repository.

`status` | Any time a Repository has a status update from the API

`team_add` | Any time a team is added or modified on a Repository.

`watch` | Any time a User watches a Repository.