For myself I can not give much feedback, as I did not make it, but that's only due to it being one weekend too late in the Summer with Kids back at school the week before.
Not only did this make it tricky for folks with kids (I have two who both would have loved it by the way and once I said it may have had live Heron feeding got very grumpy we did not go) but also any folks who work in schools, such as teachers and the like.
Drag it forward by a week or two i have think you may have got a fair few more folks attending.