ALTER TABLE events ADD COLUMN publish_at timestamptz;
ALTER TABLE events ADD COLUMN submissions_open_at timestamptz;
ALTER TABLE events ADD COLUMN submissions_close_at timestamptz;
ALTER TABLE events ADD COLUMN gallery_visible_at timestamptz;
ALTER TABLE events ADD COLUMN notes_visible_at timestamptz;
ALTER TABLE events ADD COLUMN completed_at timestamptz;
ALTER TABLE guests ADD COLUMN notification_claimed_at timestamptz;