[BUG] tentative dates for faculty summer workshop

[Tevian Dray]

We are thinking about having our summer workshop in June rather than August
this year, most likely from 6/25-29.  Any comments?

We're also hoping to attract more participants from the physical sciences,
and will probably include some additional material, based on our having
jointly taught the junior-level introduction to electromagnetism for physics
majors this past fall.

Tevian