Sounds like I should revise my earlier comment about having our solar cooking picnic somewhere a little out of the way. You guys who are coming - are you happy to be more visible?
I was in touch with Christine Dann briefly and she suggested having it somewhere like a waterfront where there are plenty of people out strolling.
The same day I heard from her, I looked at the Solar Cookers International wiki and its article about organising solar cooking events. It advocates promoting solar cooking by being visible and happy to chat to interested passers-by.
Christine also suggested we offer sun tea to anyone who would like to try some.
Still wondering about QE2 park as a possibility ... I don't know it well. If anyone has any thoughts on it, would love to hear.