Event 'updates' on event page

Would be cool to have boxes, a little bit like the updates on the dashboard, but on the event page

EDIT: Even better if it would trigger email to applicants

No files or tests are identified in the issue. Start by locating the event page, the dashboard's existing update boxes, and the applicant email flow; done would include event-page updates and email notifications to applicants, with the behavior and scope clarified first.

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