September 23-24, 2010.
All three days I have been here (twice this year and once last year), there is a group of photographers that arrive in the late afternoon (around 3pm) and stay until closing. On my second day this year, it starting raining late in the day, but they (and I) just put rain jackets on both ourselves and our cameras and had a good old time.
Unlike me, however (who uses a reasonably priced used 300 f/4 lens with extenders), they all use 500 f/4 lenses, which are around 7 or 8 thousand dollars!