Add a list of attendees visible only to authenticated users, with stats
about rsvps, events attended, and no-shows.
Change-Id: Ib9a0fe8acf8c616fb725c613494b37121a1ad0e4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4501
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI