Look on What 3 Words (uses Google Earth) and you will see there is a car park field and well developed entrances and scope for marquees, I doubt it would be the island where they have pageants and a trebuchet, (with a fiery missile).

in fact the post code would allude to the the field. see
map.what3words.com ///solid.friday.memory the portents are good! Hint Zoom out to see the scope for a festival.

Castle Park, Warwick. CV34 6AX No access from this road!