Return participant names from mock.
Show participant names; sort by name and scheduled date.  #4175.
Let the grid grow as long as it needs to.
Presentation tweaks for grid.

In particular:

- The participant column needed more breathing room to display all the
  data that it's now displaying.
- Alternate row backgrounds were found to help with reading large grids
  (and we get those quite often with Pancakes reports in the wild).
Additional letter spacing for headers.

Just trying this out; we'll see how it goes.