This info below is still valid for the 2010 Frogham fair, however the date is Saturday 28th August 2010

The main web page for the fair I linked to previously doesn’t have any location or directions, so here:
google map and directions for the fair ground from junction 1 of the M27.

for those of you so inclined, it’s Lat/Long is 50.914019 N,  1.595507W